# A052630 (b-file synthesized from sequence entry) 0 1 1 4 2 34 3 432 4 7320 5 155040 6 3940560 7 116847360 8 3959786880 9 150965337600 10 6394994323200 11 297985937356800 12 15147464243788800 13 834153946904678400 14 49469459519031552000 15 3143339899991875584000 16 213046423884047609856000