140288

Appears in sequences

• a(n)=n for n <= 3, a(n) = 2a(n-1) - 2a(n-2) + 2a(n-3) for n >= 4.at n=28A104767
• Number of n-fold branched coverings of the projective plane with r cyclic branch points (n,r>=1); array read by downward antidiagonals.at n=58A113949
• Number of subsets of {1,2,...,n} which contain no three consecutive odd numbers.at n=17A127195
• Numbers with 22 divisors.at n=32A137485
• Number T(n,k) of ways k L-tiles can be placed on an n X n square; triangle T(n,k), n>=0, 0<=k<=A229093(n), read by rows.at n=37A243608
• a(n) = (4*n+9)*n^2.at n=32A258618
• G.f. B(x) satisfies: Sum_{n>=0} (-1)^n * n * (B(x) - (-1)^n*B(-x))^n = 0.at n=6A318641