# A074404 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 1
5 8
6 36
7 160
8 548
9 1920
10 6496
11 23040
12 84565
13 317440
14 1197824
15 4508328
16 16905344
17 63406080
18 238602228
19 902430720
20 3429249843
21 13076616480
22 49977704448
23 191312691200
24 733365135860
25 2815436626328
26 10825959342080
27 41694904974720
28 160823207301705