G.f.: Sum_{n>=0} x^n * ((1+x)^n + sqrt(3)*i)^n / (1 + sqrt(3)*i*x*(1+x)^n)^(n+1), where i^2 = -1.
A323683
G.f.: Sum_{n>=0} x^n * ((1+x)^n + sqrt(3)*i)^n / (1 + sqrt(3)*i*x*(1+x)^n)^(n+1), where i^2 = -1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =11a(4) =34a(5) =147a(6) =741a(7) =3723a(8) =20622a(9) =122611a(10) =765147a(11) =5039624a(12) =34856671a(13) =251799740a(14) =1895620770a(15) =14834210103a(16) =120368044792
External references
- oeis: A323683