# A295236 (b-file synthesized from sequence entry) 1 3 2 10 3 42 4 60 5 63 6 840 7 1260 8 12642 9 18480 10 18900 11 18963 12 154350 13 228480 14 252840 15 379260 16 3458700 17 5562480 18 5688900 19 68772480 20 1041068700 21 15032156160 22 53621568000 23 4524679004160 24 9812746944000