G.f. A(x) satisfies: Sum_{n>=0} A(x)^(n*(n+1)/2) * x^n = Sum_{n>=0} (1+x)^(n*(n-1)/2) * x^n.
A326424
G.f. A(x) satisfies: Sum_{n>=0} A(x)^(n*(n+1)/2) * x^n = Sum_{n>=0} (1+x)^(n*(n-1)/2) * x^n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =4a(6) =20a(7) =62a(8) =251a(9) =1002a(10) =4295a(11) =19086a(12) =88369a(13) =423957a(14) =2104214a(15) =10783054a(16) =56969183a(17) =309900293a(18) =1733790827a(19) =9965992962a(20) =58801256594a(21) =355808106682
External references
- oeis: A326424