# A119579 (b-file synthesized from sequence entry)
0 0
1 4
2 36
3 240
4 1400
5 7560
6 38808
7 192192
8 926640
9 4375800
10 20323160
11 93117024
12 421848336
13 1892909200
14 8424486000
15 37228204800
16 163493866080
17 714083503320
18 3103696272600
19 13431200244000
20 57895542104400
21 248675137991280