31381236756
domain: N
Appears in sequences
- "BIK" (reversible, indistinct, unlabeled) transform of 2,2,2,2...at n=22A032124
- a(n) = 3^n + 9^n.at n=11A074610
- a(n) = (3^n + 2*3^(n/2)*cos(n*Pi/6))/3.at n=23A092236
- Expansion of 2*x^2*(1-2*x) / ((3*x-1)*(3*x^2-1)).at n=23A122007
- a(1) = 0, a(2) = 4, a(3) = 12; for n > 3, a(n) = 3*a(n-1) - 3*a(n-2) + 9*a(n-3).at n=22A318610