79948domain: NAppears in sequencesSum of diagonal elements and those below it for a square matrix of integers, starting with 1.at n=21A066804Triangle read by rows in which each row is the inverse binomial transform of a diagonal of A089246.at n=50A089302Pyramidal 47-gonal numbers.at n=21A130566a(n) = 2 * A000538(n).at n=11A259108