# A377682 (b-file synthesized from sequence entry)
0 1
1 0
2 4
3 6
4 40
5 180
6 948
7 5880
8 42208
9 344736
10 3158640
11 32091840
12 358107264
13 4353972480
14 57290002560
15 811116633600
16 12295029657600
17 198666240675840
18 3408788192947200
19 61898371424870400
20 1185883197069312000
21 23905764186329088000
22 505813884019270041600