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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 34 |
| 4 | 274 |
| 5 | 2566 |
| 6 | 26406 |
| 7 | 290530 |
| 8 | 3361042 |
| 9 | 40463894 |
| 10 | 503505542 |
| 11 | 6445263858 |
| 12 | 84593906962 |
| 13 | 1135730543782 |
| 14 | 15571171913958 |
| 15 | 217755224972034 |
| 16 | 3103675765823634 |
| 17 | 45064501714445366 |
| 18 | 666402338952126790 |
| 19 | 10035910959863435794 |
| 20 | 153933449475479903634 |
| 21 | 2405188381726250188486 |
| 22 | 38293058095081812664742 |
| 23 | 621408387360835449163042 |
| 24 | 10281437987942851628839442 |
| 25 | 173489555489829641553617494 |
[1,2,6,34,274,2566,26406,290530,3361042,40463894, 503505542,6445263858,84593906962,1135730543782, 15571171913958,217755224972034,3103675765823634, 45064501714445366,666402338952126790, 10035910959863435794,153933449475479903634, 2405188381726250188486,38293058095081812664742, 621408387360835449163042, 10281437987942851628839442, 173489555489829641553617494] |