A024591 - OEIS

%I #4 Mar 30 2012 18:55:58

%S 1,2,7,11,27,44,96,155,315,510,994,1608,3043,4924,9123,14761,26909,

%T 43540,78370,126805,225911,365532,645732,1044816,1832677,2965334,

%U 5170111,8365415

%N a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (F(2), F(3), ...).

%F G.f.: x(-x^4+2x^2+x+1)/[(1+x^2)(1+x-x^2)(1-x-x^2)^2].

%K nonn

%O 1,2

%A _Clark Kimberling_