1021305601domain: NAppears in sequencesA symmetrical triangle sequence: t(n,m)=n!*Eulerian[n + 1, m]^2 - n! + 1.at n=23A174692A symmetrical triangle sequence: t(n,m)=n!*Eulerian[n + 1, m]^2 - n! + 1.at n=25A174692