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A004529 Ratios of successive terms are 1,1,1,2,3,3,3,4,5,5,5,6... 1

%I

%S 1,1,1,1,2,6,18,54,216,1080,5400,27000,162000,1134000,7938000,

%T 55566000,444528000,4000752000,36006768000,324060912000,3240609120000,

%U 35646700320000,392113703520000,4313250738720000

%N Ratios of successive terms are 1,1,1,2,3,3,3,4,5,5,5,6...

%F a(n) = prod_{j=0..n-1} ( A180969(2,j+1)+A180969(2,j)+1 ) = a(n-1) * ( A180969(2,n-1)+A180969(2,n-2)+1 ). [_Adriano Caroli_, Nov 27 2010]

%K nonn

%O 0,5

%A _N. J. A. Sloane_.

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Last modified July 28 06:29 EDT 2014. Contains 244987 sequences.