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(c(p)-2)/p where p runs through the primes and where c(p) denotes the p-th Catalan number = 1/(p+1)*C(2p,p).
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%I #5 Mar 30 2012 18:39:17

%S 0,1,8,61,5344,57146,7626164,93013852,14915635376,34560076436254,

%T 469181807716997,1241913630395182226,246680941259460930098,

%U 3508220446629891899086,720612207599809508221904

%N (c(p)-2)/p where p runs through the primes and where c(p) denotes the p-th Catalan number = 1/(p+1)*C(2p,p).

%Y Cf. A000108.

%K nonn

%O 1,3

%A _Benoit Cloitre_, May 10 2003