# A309565 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 8 4 88 5 252 6 2772 7 29792 8 2112 9 4224 10 8448 11 489984 12 48384 13 2977792 14 8634368 15 405504 16 40955904 17 405909504 18 23080108032 19 25135153152 20 677707776 21 2557800087552 22 21128282112 23 633498894336 24 23255666655232 25 8691508051968 26 29142024192 27 65892155129856 28 4815463645184