404358569166
domain: N
Appears in sequences
- a(1) = 1, a(2) = 2, a(3) = 6; a(n) = 5*a(n-1) - 5*a(n-2) + a(n-3) for n > 3.at n=21A101265
- a(0) = 1, a(1) = 1, a(2) = 2; for n > 2, a(n) = 5*a(n-1) - 5*a(n-2) + a(n-3).at n=22A101879
- Expansion of x*(3*x-1)*(2*x-1) / ( (1-x)*(1+x)*(x^2-4*x+1) ).at n=23A107388
- a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*n-2*k,2*k).at n=21A387689