1362649145domain: NAppears in sequencesBinomial coefficient C(47,n).at n=9A010963Binomial coefficient C(n,38).at n=9A010991Binomial coefficients C(2*n+9,9).at n=19A053138Triangle, read by rows, where T(n,k) = C(n*(n-1)/2-k*(k-1)/2+n-k+2, n-k).at n=45A107870Column 0 of triangle A107870; a(n) = C( n*(n-1)/2 + n+2, n).at n=9A107871