56229888

Appears in sequences

• 8-fold convolution of A000302 (powers of 4).at n=7A054338
• Number of walks of length n on square lattice, starting at origin, staying on points with x+y >= 0.at n=14A060899
• Determinant of n X n matrix M(i,j) = binomial(2i-1,j), (i,j) ranging from 1 to n.at n=7A086229
• a(n) = 4^n*(2*n)!/(n!)^2.at n=7A098430
• Expansion of e.g.f. BesselI(0,4*x)+BesselI(1,4*x)/2.at n=14A098664
• Triangle T, read by rows, where matrix power T^-2 has -2^(n+1) in the secondary diagonal: [T^-2](n+1,n) = -2^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=28A117265
• Central terms of triangle A249307.at n=14A249308
• a(n) = 2^n*n!/(floor(n/2)!)^2.at n=14A253665
• Expansion of ((1 + 4*x)/(1 - 4*x))^(1/2).at n=14A304940
• a(n) = n*binomial(n, n/2) if n is even otherwise 2^(n-1)*binomial(n-1, (n-1)/2).at n=15A389423