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A027786 a(n) = 13*(n+1)*binomial(n+2,13)/2. 1
78, 1183, 9555, 54600, 247520, 946764, 3174444, 9573720, 26453700, 67897830, 163601438, 373173528, 811246800, 1690097500, 3389852700, 6571099080, 12351232530, 22574731725, 40219349625, 69995780400, 119218619520, 199052516520, 326270653800, 525704634000 (list; graph; refs; listen; history; text; internal format)
OFFSET

11,1

LINKS

T. D. Noe, Table of n, a(n) for n = 11..1000

FORMULA

Number of 16-subsequences of [ 1, n ] with just 2 contiguous pairs; g.f. 13*(6+x)*x^11/(1-x)^15

a(n) = C(n+1, 12)*C(n+2, 2). - Zerinvary Lajos, Apr 28 2005, corrected by R. J. Mathar, Mar 15 2016

MATHEMATICA

Table[13 (n + 1) Binomial[n + 2, 13]/2, {n, 11, 40}] (* Wesley Ivan Hurt, Mar 30 2017 *)

CROSSREFS

Sequence in context: A119093 A128951 A272383 * A175383 A190396 A230521

Adjacent sequences:  A027783 A027784 A027785 * A027787 A027788 A027789

KEYWORD

nonn,easy

AUTHOR

thi ngoc dinh (via R. K. Guy)

STATUS

approved

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Last modified June 24 14:24 EDT 2021. Contains 345417 sequences. (Running on oeis4.)