G.f. satisfies: A(x) = exp( Sum_{n>=1} [A(x)^n + 1/A(-x)^n]*x^n/n ).
A171191
G.f. satisfies: A(x) = exp( Sum_{n>=1} [A(x)^n + 1/A(-x)^n]*x^n/n ).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =20a(4) =73a(5) =263a(6) =1111a(7) =4451a(8) =20161a(9) =85304a(10) =401401a(11) =1755593a(12) =8465311a(13) =37866818a(14) =185756605a(15) =844627115a(16) =4196759383a(17) =19321634594a(18) =96962969047a(19) =450810982796
External references
- oeis: A171191