8996462475domain: NAppears in sequencesBinomial coefficient C(3n,n-10).at n=9A004328Binomial coefficient C(n,48).at n=9A011001Binomial coefficients C(57,n).at n=9A017773Binomial coefficients C(2*n+9,9).at n=24A053138Column 1 of triangle A107873; a(n) = C( n*(n+1)/2 + n+3, n).at n=9A107875