450097

Appears in sequences

• Triangle T(n,k) read by rows given by [0, 1, 3, 6, 10, 15, 21, ...] DELTA [1, 3, 6, 10, 15, 21, 28,...] where DELTA is the operator defined in A084938.at n=24A087736
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=24A192958