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A027773 (n+1)*C(n+1,13). 2
13, 196, 1575, 8960, 40460, 154224, 515508, 1550400, 4273290, 10943240, 26313518, 59907456, 130007500, 270415600, 541574100, 1048380480, 1968053535, 3592795500, 6393845325, 11115955200, 18914492520, 31551447840, 51671823000, 83188425600, 131811290100 (list; graph; refs; listen; history; text; internal format)
OFFSET

12,1

COMMENTS

Number of 15-subsequences of [ 1, n ] with just 1 contiguous pair.

LINKS

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

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

FORMULA

G.f.: (13+x)*x^12/(1-x)^15.

MATHEMATICA

(#+1)Binomial[#+1, 13]&/@Range[12, 40]  (* Harvey P. Dale, Mar 18 2011 *)

CROSSREFS

Sequence in context: A228659 A221581 A015690 * A099271 A081796 A140536

Adjacent sequences:  A027770 A027771 A027772 * A027774 A027775 A027776

KEYWORD

nonn,easy

AUTHOR

thi ngoc dinh (via R. K. Guy)

STATUS

approved

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Last modified January 25 19:09 EST 2020. Contains 331249 sequences. (Running on oeis4.)