27540584512domain: NAppears in sequencesBinomial coefficient C(4n,n-7).at n=9A004337Binomial coefficients C(n,55).at n=9A017719Binomial coefficients C(64,n).at n=9A017780a(n) = binomial((n-1)^2, n).at n=8A178842Triangle defined by T(n,k) = binomial(n^2, k^2), for n>=0, k=0..n, as read by rows.at n=39A226234