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A117251 Column 0 of triangle A117250. 1

%I #3 Mar 30 2012 18:36:55

%S 1,1,-1,4,-40,896,-43008,4325376,-899678208,383862702080,

%T -334114095890432,590956713604022272,-2117988861556815822848,

%U 15348576513041885002989568,-224527747847927003472304537600,6621592717332784844802427579269120

%N Column 0 of triangle A117250.

%F a(n) = (-1)^(n-1) * C(2*n,n)/(2*n-1) * 2^((n-1)*(n-2)/2-1).

%o (PARI) a(n)=(-1)^(n-1)*2^((n-1)*(n-2)/2-1)*binomial(2*n,n)/(2*n-1)

%K sign

%O 0,4

%A _Paul D. Hanna_, Mar 14 2006

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)