# A062177 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 12 5 24 6 72 7 192 8 720 9 1440 10 4320 11 11520 12 43200 13 103680 14 362880 15 1105920 16 4665600 17 9331200 18 27993600 19 74649600 20 279936000 21 671846400 22 2351462400 23 7166361600 24 30233088000 25 67184640000 26 221709312000 27 644972544000