1882933364

Appears in sequences

• Number of dissections of a polygon: binomial(4*n, n)/(3*n + 1).at n=12A002293
• a(3n+k) = (k+1)*binomial(4n+k, n)/(3n+k+1), where k is n reduced mod 3.at n=36A124753
• a(n) = binomial(8*n, 2*n) / (6*n + 1).at n=6A235536
• Expansion of g.f. A(x) satisfying A(x) = 1 + x*(3*A(x)^2 + A(-x)^2)/4.at n=24A369082
• Number of achiral polyominoes composed of n pentagonal cells of the hyperbolic regular tiling with Schläfli symbol {5,oo}.at n=23A369472