17450721000domain: NAppears in sequencesa(n) = binomial(2*n+1,n)*(n+1)^2.at n=14A002544Reduced denominators of the (2n-1)th raw moment of the distribution of line lengths of points picked at random in a unit square.at n=13A103305a(n) = C(n+2,2)*C(n,floor(n/2)).at n=28A107231