# A113248 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 8 4 56 5 336 6 2496 7 19968 8 181248 9 1812480 10 19956480 11 239477760 12 3113487360 13 43588823040 14 653836861440 15 10461389783040 16 177843708887040 17 3201186759966720 18 60822550111518720 19 1216451002230374400