3052323

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=13A178963
• Number T(n,k) of permutations of [n] with exactly k occurrences of the consecutive step pattern up, down, down; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/3)), read by rows.at n=35A242819
• Number of permutations of [n] with exactly four occurrences of the consecutive step pattern up, down, down.at n=0A246249
• The number of 3-alternating permutations of [n].at n=13A249402
• Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type E_n joins.at n=4A293952