G.f. satisfies: A(x) = 1 + Sum_{n>=1} (x*A(x))^(n^2) * (A(x)^n + 1/A(x)^n).
A200222
G.f. satisfies: A(x) = 1 + Sum_{n>=1} (x*A(x))^(n^2) * (A(x)^n + 1/A(x)^n).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =42a(5) =164a(6) =688a(7) =3024a(8) =13680a(9) =63110a(10) =295520a(11) =1401012a(12) =6713280a(13) =32470468a(14) =158343504a(15) =777725264a(16) =3843992546a(17) =19104857608a(18) =95419519076a(19) =478668009828
External references
- oeis: A200222