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A027822 42*(n+1)*C(n+6,10). 1
210, 2772, 19404, 96096, 378378, 1261260, 3699696, 9801792, 23891868, 54318264, 116396280, 237025152, 461705244, 864913896, 1565082288, 2745758400, 4684950270, 7795127340, 12676924260, 20190250080, 31547265750, 48432564180, 73156880160, 108851783040 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

T. D. Noe, Table of n, a(n) for n = 4..1000

FORMULA

Number of 17-subsequences of [ 1, n ] with just 6 contiguous pairs; g.f. 42*(5+6*x)*x^4/(1-x)^12.

a(n) = C(n+1,5)*C(n+6,6). - Zerinvary Lajos, Jun 08 2005

CROSSREFS

Sequence in context: A064260 A027806 A024407 * A024449 A235240 A103604

Adjacent sequences:  A027819 A027820 A027821 * A027823 A027824 A027825

KEYWORD

nonn

AUTHOR

thi ngoc dinh (via R. K. Guy)

STATUS

approved

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Last modified June 26 04:11 EDT 2019. Contains 324369 sequences. (Running on oeis4.)