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A027806 30*(n+1)*C(n+4,10). 1
210, 2640, 17820, 85800, 330330, 1081080, 3123120, 8168160, 19691100, 44341440, 94225560, 190466640, 368588220, 686439600, 1235591280, 2157381600, 3665097150, 6074125200, 9842332500, 15623407800, 24336462150, 37255818600, 56125648800, 83304936000, 121949170200 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,1

LINKS

T. D. Noe, Table of n, a(n) for n = 6..1000

FORMULA

Number of 15-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 30*(7+4x)*x^6/(1-x)^12

a(n) = C(n+1, 7)*C(n+4, 4) - Zerinvary Lajos, May 26 2005, corrected by R. J. Mathar, Feb 13 2016

CROSSREFS

Sequence in context: A135201 A187663 A064260 * A024407 A027822 A024449

Adjacent sequences:  A027803 A027804 A027805 * A027807 A027808 A027809

KEYWORD

nonn

AUTHOR

thi ngoc dinh (via R. K. Guy)

STATUS

approved

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Last modified June 17 07:31 EDT 2019. Contains 324183 sequences. (Running on oeis4.)