# A107547 (b-file synthesized from sequence entry) 0 1 1 392 2 28784 3 840504 4 13573536 5 143640616 6 1105549200 7 6639777880 8 32715396672 9 137213776840 10 503732312496 11 1653861270136 12 4938858514912 13 13596421325928 14 34882914424528 15 84149325402520 16 192278048807040 17 418712196495880 18 873484676706032 19 1753309713352120