78731

Appears in sequences

• Number of alpha-beta evaluations in a tree of depth n and branching factor b=3.at n=19A060647
• Clique number of commuting graph of symmetric group S_n.at n=31A135908
• Clique number of commuting graph of alternating group A_n.at n=31A135909
• a(n) = 4*3^n-1.at n=9A171498
• Expansion of (1+3*x+5*x^2-x^3)/((1-x^2)*(1-3*x^2)).at n=19A220944
• Rectangular companion array to M(n,k), given in A239126, showing the end numbers N(n, k), k >= 1, for the Collatz operation (ud)^n, n >= 1, ending in an odd number, read by antidiagonals.at n=53A239127
• The number of unordered binary trees that contain n distinct subtrees.at n=7A255841
• Array A read by upward antidiagonals in which the entry in row n and column k is defined by A(n,k) = (3/2)*(3^k - 1) + A265159(n,k), n,k >= 1.at n=43A265161
• Expansion of g.f.: (1 + x - 2*x^2 + 2*x^4)/((1-x)*(1-3*x^2)).at n=20A358027