62020
domain: N
Appears in sequences
- a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,0,1,0.at n=18A025275
- Base-11 analog of A208059.at n=60A212999
- a(n) = n*(3*n^2 - 5*n + 3).at n=28A226450
- Number of non-equivalent ways to choose two points in an equilateral triangle grid of side n.at n=40A227327
- Expansion of g.f. A(x) satisfying 3 = Sum_{n=-oo..+oo} (-1)^n * x^(2*n) * (3*A(x) + x^(n-2))^(n+1).at n=9A363108
- Expansion of 1/(1 - x^2/(1-9*x)^(1/3)).at n=8A369627