290752384208domain: NAppears in sequencesBinomial coefficient C(4n,n-7).at n=10A004337Binomial coefficients C(n,58).at n=10A017722Binomial coefficients C(68,n).at n=10A017784Column 1 of triangle A107873; a(n) = C( n*(n+1)/2 + n+3, n).at n=10A107875