708930508domain: NAppears in sequencesa(n) = C(4n,n-2).at n=9A004332Binomial coefficient C(44,n).at n=9A010960Binomial coefficient C(n,35).at n=9A010988Binomial coefficients C(2*n-8,9).at n=17A053131a(n) = binomial(5*n-1,n).at n=9A163455a(n) = [x^n] 1/(1 - x)^(n*(n-1)/2).at n=9A386879