Coefficient of x^n in the expansion of 1 / (1-x-x^2)^(3*n).
A370620
Coefficient of x^n in the expansion of 1 / (1-x-x^2)^(3*n).
Terms
- a(0) =1a(1) =3a(2) =27a(3) =255a(4) =2535a(5) =25908a(6) =269667a(7) =2843214a(8) =30264975a(9) =324543495a(10) =3500669172a(11) =37940361660a(12) =412830243735
External references
- oeis: A370620