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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 38 |
| 4 | 313 |
| 5 | 2834 |
| 6 | 27088 |
| 7 | 269380 |
| 8 | 2757797 |
| 9 | 28872568 |
| 10 | 307696566 |
| 11 | 3326835855 |
| 12 | 36403128996 |
| 13 | 402370063992 |
| 14 | 4485931975701 |
| 15 | 50386112677647 |
| 16 | 569624341701738 |
| 17 | 6476615022560400 |
| 18 | 74013180802610161 |
| 19 | 849642206122063571 |
| 20 | 9793310961240979983 |
| 21 | 113297108937174512275 |
[1,1,5,38,313,2834,27088,269380,2757797,28872568, 307696566,3326835855,36403128996,402370063992, 4485931975701,50386112677647,569624341701738, 6476615022560400,74013180802610161, 849642206122063571,9793310961240979983, 113297108937174512275] |