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A027787 a(n) = 7*(n+1)*C(n+2,14). 1
91, 1470, 12600, 76160, 364140, 1465128, 5155080, 16279200, 47006190, 125847260, 315762216, 748843200, 1690097500, 3650610600, 7582037400, 15201516960, 29520803025, 55688330250, 102301525200, 183413260800, 321546372840, 552150337200, 930092814000 (list; graph; refs; listen; history; text; internal format)
OFFSET

12,1

COMMENTS

Number of 17-subsequences of [ 1, n ] with just 2 contiguous pairs.

LINKS

T. D. Noe, Table of n, a(n) for n = 12..1000

FORMULA

G.f.: 7*(13+2x)*x^12/(1-x)^16.

a(n) = C(n+1, 13)*C(n+2, 2). - Zerinvary Lajos, May 10 2005, corrected by R. J. Mathar, Mar 16 2016

MATHEMATICA

Table[7(n+1)Binomial[n+2, 14], {n, 12, 40}] (* Harvey P. Dale, Jul 18 2011 *)

CROSSREFS

Sequence in context: A195221 A213559 A120756 * A333112 A140667 A221939

Adjacent sequences:  A027784 A027785 A027786 * A027788 A027789 A027790

KEYWORD

nonn

AUTHOR

thi ngoc dinh (via R. K. Guy)

EXTENSIONS

Offset corrected by Harvey P. Dale, Jul 18 2011

STATUS

approved

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Last modified March 28 11:00 EDT 2020. Contains 333083 sequences. (Running on oeis4.)