# A353884 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 0 5 0 6 20 7 210 8 1400 9 7560 10 36120 11 159390 12 1035100 13 17082780 14 329893564 15 5336661330 16 73265956400 17 889068944400 18 9968073461616 19 112902000191334 20 1531070090032500 21 27610559023112100 22 586336131631313140 23 12550716321612658266 24 254052845940651258600