G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} C(n,k)*A(x^(n+k)) ).
A199102
G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} C(n,k)*A(x^(n+k)) ).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =63a(5) =213a(6) =719a(7) =2505a(8) =8864a(9) =31948a(10) =116725a(11) =432074a(12) =1616022a(13) =6100775a(14) =23214144a(15) =88949045a(16) =342899474a(17) =1329020016a(18) =5175758820a(19) =20243197030a(20) =79480515302a(21) =313155710230
External references
- oeis: A199102