# A342856 (b-file synthesized from sequence entry)
1 1
2 24
3 120
4 720
5 5040
6 40320
7 362880
8 3628800
9 39916800
10 479001600
11 6227020800
12 87178291200
13 1307674368000
14 20922789888000
15 355687428096000
16 6402373705728000
17 121645100408832000
18 2432902008176640000
19 51090942171709440000
20 1124000727777607680000