# A328448 (b-file synthesized from sequence entry) 1 2 2 6 3 12 4 504 5 60 6 420 7 840 8 4084080 9 2520 10 21162960 11 27720 12 2059318800 13 0 14 360360 15 720720 16 8494326640800 17 12252240 18 281206918792800 19 0 20 0 21 232792560 22 409547311252279200 23 5354228880 24 619808900849199341280 25 26771144400 26 54749786241679275146400 27 80313433200 28 5663770990518545704800