G.f.: Sum_{n>=0} x^n * ((1+x)^n + sqrt(2)*i)^n / (1 + sqrt(2)*i*x*(1+x)^n)^(n+1), where i^2 = -1.
A323682
G.f.: Sum_{n>=0} x^n * ((1+x)^n + sqrt(2)*i)^n / (1 + sqrt(2)*i*x*(1+x)^n)^(n+1), where i^2 = -1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =28a(5) =117a(6) =547a(7) =2671a(8) =14258a(9) =81335a(10) =490525a(11) =3124166a(12) =20903467a(13) =146330944a(14) =1068670938a(15) =8119799153a(16) =64030850716a(17) =522964211565
External references
- oeis: A323682