Composition of the g.f. of A086246 with itself.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =10a(5) =28a(6) =84a(7) =264a(8) =860a(9) =2880a(10) =9862a(11) =34392a(12) =121770a(13) =436688a(14) =1583146a(15) =5793216a(16) =21370806a(17) =79391536a(18) =296760222a(19) =1115327844a(20) =4212125662a(21) =15976390684a(22) =60833679424a(23) =232452408632a(24) =891060970152