# A098710 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 48
5 120
6 8640
7 5040
8 1935360
9 2177280
10 870912000
11 39916800
12 99325771776000
13 6227020800
14 878757175296000
15 941525544960000
16 40493130637639680000
17 355687428096000
18 20073254719690742169600000
19 121645100408832000
20 50852245289883213496320000000
21 1544990091272493465600000