a(0) = 2, a(n) = (-1)^n + (-2)^n + (1/2) * Sum_{j=1..n} (1-(-1)^j-(-2)^j) * binomial(n,j) * a(n-j) for n > 0.
A370163
a(0) = 2, a(n) = (-1)^n + (-2)^n + (1/2) * Sum_{j=1..n} (1-(-1)^j-(-2)^j) * binomial(n,j) * a(n-j) for n > 0.
Terms
- a(0) =2a(1) =1a(2) =5a(3) =25a(4) =161a(5) =1321a(6) =13025a(7) =149605a(8) =1963841a(9) =29004721a(10) =475975745a(11) =8591917885a(12) =169193833121
External references
- oeis: A370163