97251domain: NAppears in sequencesa(n) = (n^4 + n)/2 (Row sums of an n X n X n magic cube, when it exists).at n=21A027441Numbers of the form k*(k^3 +- 1)/2.at n=41A057590Number of divisors d of n! such that d+1 is prime.at n=26A067847Magic constant of smallest order-n perfect magic cube.at n=20A109130