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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 26 |
| 4 | 172 |
| 5 | 1354 |
| 6 | 12403 |
| 7 | 127945 |
| 8 | 1471006 |
| 9 | 18589503 |
| 10 | 255951308 |
| 11 | 3808299648 |
| 12 | 60871219649 |
| 13 | 1039240205691 |
| 14 | 18868377309780 |
| 15 | 362838034712928 |
| 16 | 7364831540699076 |
| 17 | 157305165900364641 |
| 18 | 3526069495916583260 |
| 19 | 82744901973286823822 |
| 20 | 2028396974232995349291 |
[1,1,5,26,172,1354,12403,127945,1471006,18589503, 255951308,3808299648,60871219649,1039240205691, 18868377309780,362838034712928,7364831540699076, 157305165900364641,3526069495916583260, 82744901973286823822,2028396974232995349291] |