a(n) = [x^(2^n+n-2)] (x + x^2 + x^4 + x^8 + ... + x^(2^n))^n /(n*(n-1)/2) for n>=2.
A135071
a(n) = [x^(2^n+n-2)] (x + x^2 + x^4 + x^8 + ... + x^(2^n))^n /(n*(n-1)/2) for n>=2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =40a(5) =236a(6) =1876a(7) =9948a(8) =147880a(9) =1453960a(10) =22015900a(11) =208197540a(12) =4313645260a(13) =50025596492a(14) =908013578304
External references
- oeis: A135071