# A074850 (b-file synthesized from sequence entry)
1 3
2 3
3 12
4 12
5 60
6 540
7 1080
8 6480
9 32400
10 97200
11 486000
12 3888000
13 34992000
14 244944000
15 2204496000
16 6613488000
17 13226976000
18 39680928000
19 317447424000
20 1269789696000
21 7618738176000
22 15237476352000
23 91424858112000