# A013031 (b-file synthesized from sequence entry) 0 1 1 4 2 80 3 3928 4 359040 5 52717856 6 11352019840 7 3370401007488 8 1319560185804800 9 658698869874201088 10 408325769541831280640 11 307740770628961995577344 12 277115224743231975378370560