16591655817
domain: N
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=17A178963
- Number of permutations p of [n] such that p(i) > p(i+1) iff i == 2 (mod 3).at n=17A249583
- Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type B_n joins.at n=5A293951