# A179079 (b-file synthesized from sequence entry) 1 1 2 4 3 9 4 34 5 192 6 1032 7 6936 8 62496 9 530712 10 5005152 11 61710336 12 707802624 13 8714718720 14 133983590400 15 1938416832000 16 29588291712000 17 544216485888000 18 9509523337728000 19 173318541516288000 20 3711395156281344000 21 76000261811572224000 22 1610876530967703552000 23 39351073330327191552000