Coefficient of x^n in the expansion of ( (1+x) * (1+x+x^2)^3 )^n.
A370171
Coefficient of x^n in the expansion of ( (1+x) * (1+x+x^2)^3 )^n.
Terms
- a(0) =1a(1) =4a(2) =34a(3) =319a(4) =3146a(5) =31929a(6) =330145a(7) =3458620a(8) =36585194a(9) =389893576a(10) =4179819559a(11) =45025583343a(12) =486961123577
External references
- oeis: A370171