843448320
domain: N
Appears in sequences
- 9-fold convolution of A000302 (powers of 4).at n=8A054339
- Number of walks of length n on square lattice, starting at origin, staying on points with x+y >= 0.at n=16A060899
- Determinant of n X n matrix M(i,j) = binomial(2i+1, j).at n=7A086228
- a(n) = 4^n*(2*n)!/(n!)^2.at n=8A098430
- Expansion of e.g.f. BesselI(0,4*x)+BesselI(1,4*x)/2.at n=16A098664
- Central terms of triangle A249307.at n=16A249308
- a(n) = 2^n*n!/(floor(n/2)!)^2.at n=16A253665
- Expansion of ((1 + 4*x)/(1 - 4*x))^(1/2).at n=16A304940
- a(n) = n*binomial(n, n/2) if n is even otherwise 2^(n-1)*binomial(n-1, (n-1)/2).at n=17A389423