# A338077 (b-file synthesized from sequence entry) 0 1 1 9 2 126 3 2310 4 47250 5 1027026 6 23207184 7 538748496 8 12757863690 9 306752696250 10 7465133615940 11 183458150153460 12 4545211223957040 13 113378500045162800 14 2844670649392440000 15 71731904712206892480 16 1816739665054871280570 17 46189610653753780435530 18 1178358502858339948645500