# A121648 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 9
5 25
6 64
7 256
8 729
9 2601
10 7921
11 28900
12 90000
13 318096
14 1016064
15 3888784
16 12694969
17 46881409
18 155825289
19 592435600
20 1987643889
21 7408217041
22 25153960000
23 95823678916
24 327811212304
25 1227814692624
26 4234507915264