# A092420 (b-file synthesized from sequence entry) 1 1 2 10 3 90 4 801 5 7120 6 63280 7 562401 8 4998330 9 44422570 10 394804801 11 3508820640 12 31184580960 13 277152408001 14 2463187091050 15 21891531411450 16 194560595612001 17 1729153829096560 18 15367823866257040 19 136581260967216801