25740261

Appears in sequences

• E.g.f.: (3+2*sqrt(3)*exp(x/2)*sin(sqrt(3)*x/2))/(exp(-x)+2*exp(x/2)*cos(sqrt(3)*x/2)).at n=14A178963
• Number of permutations p of [n] such that p(i) > p(i+1) iff i == 2 (mod 3).at n=14A249583
• Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type B_n joins.at n=4A293951
• Coefficients of the Omega polynomials of order 3, triangle T(n,k) read by rows with 0<=k<=n.at n=16A318147
• Coefficient of x of the OmegaPolynomials (A318146), T(n, k) = [x] P(n, k) with n>=1 and k>=0, square array read by ascending antidiagonals.at n=33A318253
• Associated Omega numbers of order 3, triangle T(n,k) read by rows for n >= 0 and 0 <= k <= n.at n=20A318255