33910

Appears in sequences

• G.f.: (1-x)^9/((1-5*x+6*x^2-4*x^3+x^4)*(-1+4*x-3*x^2+x^3)*(1-3*x+x^2)*(-1+2*x)).at n=7A089947
• a(n) = 997*n + 1009.at n=33A100776
• Triangle read by rows: number of circular permutations of [1..n] with k modular progressions of rise 1, distance 1 and length 3 (n >= 3, 0 <= k <= n).at n=50A216722
• Second column of A216722.at n=7A216723
• Number of non-isomorphic T_0 set systems of weight n.at n=14A319559