# A325514 (b-file synthesized from sequence entry)
0 2
1 2
2 4
3 8
4 24
5 72
6 600
7 4200
8 101640
9 2042040
10 107869080
11 6435365640
12 644779672680
13 62219208188280
14 14408598135902520
15 3195700205016233640
16 1246437353286578234760
17 527744165981695537415640
18 417665868515500206974318760
19 314096677106179199154141208440