|
%I
%S 15,140,700,2520,7350,18480,41580,85800,165165,300300,520520,866320,
%T 1392300,2170560,3294600,4883760,7088235,10094700,14132580,19481000,
%U 26476450,35521200,47092500,61752600,80159625
%N 5*(n+1)*C(n+4,6).
%F Number of 11-subsequences of [ 1, n ] with just 4 contiguous pairs; g.f. 5*(3+4x)*x^2/(1-x)^8
%F C(n+3, 3)*C(n+6, 4) - Zerinvary Lajos (zlaja(AT)freemail.hu), May 10 2005
%K nonn,changed
%O 2,1
%A thi ngoc dinh (via _R. K. Guy_)
|
