Binomial Coefficients and Enumeration of Restricted Words
Milan Janjić
Department of Mathematics and Informatics
University of Banja Luka
Banja Luka, 78000
Republic of Srpska, Bosnia and Herzegovina
Abstract:
We derive partial solutions for a recently-posed problem of the
enumeration of restricted words. We obtain several explicit formulas in
which the number of restricted words is expressed in terms of the
binomial coefficients. These results establish relations between the
partial Bell polynomials and the binomial coefficients.
In particular, we link the r-step Fibonacci numbers, the binomial
coefficients, and the partitions of a positive integer into at most r
parts. Also, we prove that several well-known classes of integers can
be interpreted in terms of compositions. We finish the paper with an
extension of a recent result about Euler-type identities for integer
compositions.
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(Concerned with sequences
A000027
A000125
A000217
A000270
A000290
A000326
A000384
A000566
A000578
A000930
A000931
A001590
A002411
A002414
A003269
A005251
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A005253
A008778
A008779
A008998
A008999
A017817
A017898
A049856
A051937
A052541
A052917
A052920
A052927
A071675
A079960
A079976
A096000
A099524
A108750
A108758
A117760
A124304
A126030
A159284
A180177
A191238
A198295
A205553 and
A253189.)
Received January 7 2016; revised versions received June 13 2016; June 28 2016; July 10 2016.
Published in Journal of Integer Sequences,
August 29 2016.
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