# A061464 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 108 4 6912 5 21600000 6 583200000 7 480290277600000 8 31476303632793600000 9 16727798278915463577600000 10 52274369621610823680000000000 11 14914487726878692033020558868480000000000