G.f.: A(x) = exp(Sum_{n>=1} A157311(n)*x^n/n) = Product_{n>=1} (1 + A157311(n-1)*x^n).
A157312
G.f.: A(x) = exp(Sum_{n>=1} A157311(n)*x^n/n) = Product_{n>=1} (1 + A157311(n-1)*x^n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =18a(6) =84a(7) =481a(8) =3249a(9) =25359a(10) =224000a(11) =2208441a(12) =24019991a(13) =285633470a(14) =3685413373a(15) =51271476627a(16) =764944009086
External references
- oeis: A157312