%I #5 Mar 30 2012 18:39:22

%S 0,35,259,6665,335923,27484625,3305838667,548549148665,

%T 120046523944291,33497222700551585,11607372388687929595,

%U 4890106826755096362185,2461501533722532841839379,1459003091037934911760465265

%N a(n)=(-1)^(n+1)*6*(36^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.

%o (PARI) a(n)=(-1)^(n+1)*6*(36^n-1)*bernfrac(2*n)

%K nonn

%O 0,2

%A _Benoit Cloitre_, Dec 13 2003