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A027806 30*(n+1)*C(n+4,10). 1

%I

%S 210,2640,17820,85800,330330,1081080,3123120,8168160,19691100,

%T 44341440,94225560,190466640,368588220,686439600,1235591280,

%U 2157381600,3665097150,6074125200,9842332500,15623407800,24336462150,37255818600,56125648800,83304936000,121949170200

%N 30*(n+1)*C(n+4,10).

%H T. D. Noe, <a href="/A027806/b027806.txt">Table of n, a(n) for n = 6..1000</a>

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

%F a(n) = C(n+1, 7)*C(n+4, 4) - _Zerinvary Lajos_, May 26 2005, corrected by _R. J. Mathar_, Feb 13 2016

%K nonn

%O 6,1

%A thi ngoc dinh (via _R. K. Guy_)

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Last modified October 23 20:17 EDT 2019. Contains 328373 sequences. (Running on oeis4.)