# A179493 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 12 4 108 5 1420 6 24660 7 541968 8 14547792 9 465228720 10 17385553440 11 747776581200 12 36566808933600 13 2012537262763872 14 123612631608883872 15 8412289268206662720 16 630378349868153698560 17 51733701375836221013760