# A000425 (b-file synthesized from sequence entry) 1 2 2 0 3 0 4 8 5 30 6 192 7 1344 8 10800 9 97434 10 976000 11 10749024 12 129103992 13 1679495350 14 23525384064 15 353028802560 16 5650370001120 17 96082828074162 18 1729886440780800 19 32874134679574208 20 657589108734075240 21 13811277748363437006 22 303884178002526338624