# A115138 (b-file synthesized from sequence entry)
0 1
1 -1
2 1
3 15
4 113
5 783
6 5361
7 36879
8 255985
9 1794063
10 12689393
11 90505231
12 650379249
13 4705157135
14 34244198385
15 250572963855
16 1842382110705
17 13605619630095
18 100872203796465
19 750556607938575
20 5602962592235505
21 41952165966643215
22 314983352736153585