1224440064domain: NAppears in sequencesa(n) = 2*(2n)^(n-2).at n=8A097629The second largest value of permanent of (0,1) square matrices of order n with row and column sums equal to 3.at n=6A232636Powers k^m, m > 1, where k is an Achilles number that has a primorial kernel but is not a product of primorials.at n=19A389374