G.f.: A(x) = Sum_{n>=0} (4n)!/n!^4 * x^(2n)/(1-2*x)^(4n+1).
A183067
G.f.: A(x) = Sum_{n>=0} (4n)!/n!^4 * x^(2n)/(1-2*x)^(4n+1).
Terms
- a(0) =1a(1) =2a(2) =28a(3) =248a(4) =3976a(5) =52112a(6) =850144a(7) =13032896a(8) =217878616a(9) =3594283952a(10) =61577419168
External references
- oeis: A183067