G.f. satisfies: A(x) = A( x^2*A000108(x^2) )*x*A000984(x^2), where A000108(x) is the g.f. for the Catalan sequence and A000984(x) = d/dx x*A000108(x).
A096971
G.f. satisfies: A(x) = A( x^2*A000108(x^2) )*x*A000984(x^2), where A000108(x) is the g.f. for the Catalan sequence and A000984(x) = d/dx x*A000108(x).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =49a(5) =181a(6) =685a(7) =2605a(8) =9988a(9) =38479a(10) =148879a(11) =577930a(12) =2249698a(13) =8777614a(14) =34315012a(15) =134377393a(16) =526994773a(17) =2069403898a(18) =8135377102a(19) =32014655626a(20) =126099239329a(21) =497083313908
External references
- oeis: A096971