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A027776 (n+1)*C(n+1,16). 2
16, 289, 2754, 18411, 96900, 427329, 1641486, 5638611, 17651304, 51074375, 138105110, 352023165, 851809140, 1968053535, 4362680250, 9316746045, 19234572480, 38504502630, 74934688620, 142097513250, 263083395960, 476403662790, 845119028340, 1470739178610 (list; graph; refs; listen; history; text; internal format)
OFFSET

15,1

LINKS

T. D. Noe, Table of n, a(n) for n = 15..1000

Luis Manuel Rivera, Integer sequences and k-commuting permutations, arXiv preprint arXiv:1406.3081, 2014

FORMULA

Number of 18-subsequences of [ 1, n ] with just 1 contiguous pair; g.f. (16+x)*x^15/(1-x)^18

MATHEMATICA

Table[(n + 1) Binomial[n + 1, 16], {n, 15, 100}] (* T. D. Noe, Mar 28 2012 *)

CROSSREFS

Sequence in context: A182608 A320763 A225194 * A140770 A099279 A202878

Adjacent sequences:  A027773 A027774 A027775 * A027777 A027778 A027779

KEYWORD

nonn,easy

AUTHOR

thi ngoc dinh (via R. K. Guy)

EXTENSIONS

Incorrect formula deleted. - R. J. Mathar, Feb 13 2016

STATUS

approved

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Last modified November 30 19:02 EST 2021. Contains 349424 sequences. (Running on oeis4.)