# A012248 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 1
5 9
6 49
7 225
8 897
9 11025
10 96801
11 893025
12 6803457
13 108056025
14 1275363153
15 18261468225
16 207592347393
17 4108830350625
18 60889593787713
19 1187451971330625
20 17888210916886017
21 428670161650355625
22 7679611833095218545
23 189043541287806830625
24 3530100224793651058305