# A255432 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 12 5 36 6 160 7 680 8 4368 9 24976 10 219616 11 1599104 12 18145600 13 160805568 14 2245960704 15 23437238656 16 389201754368 17 4669754525952 18 89893314615808 19 1218303508421632 20 26673872401980416 21 402798557886395392 22 9883555312758398976