G.f.: A(x) = 1 + x*A(x)^3 / ( A(-x)*A(I*x)*A(-I*x) ), where I^2 = -1.
A216712
G.f.: A(x) = 1 + x*A(x)^3 / ( A(-x)*A(I*x)*A(-I*x) ), where I^2 = -1.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =22a(4) =140a(5) =514a(6) =3444a(7) =23790a(8) =165932a(9) =774610a(10) =5767268a(11) =42526198a(12) =310791884a(13) =1574532626a(14) =12230311188a(15) =92980917006a(16) =696528653740
External references
- oeis: A216712