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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 25 |
| 5 | 104 |
| 6 | 634 |
| 7 | 1236 |
| 8 | 22613 |
| 9 | 103409 |
| 10 | 929044 |
| 11 | 6298419 |
| 12 | 80396036 |
| 13 | 843325558 |
| 14 | 5843115733 |
| 15 | 24428345613 |
| 16 | 515211289906 |
| 17 | 4021634909249 |
| 18 | 77930896716918 |
| 19 | 387592118891917 |
| 20 | 53467625139656294 |
| 21 | 258820291307490689 |
| 22 | 2600667638804262010 |
| 23 | 29899374277934530878 |
[1,3,6,25,104,634,1236,22613,103409,929044, 6298419,80396036,843325558,5843115733,24428345613, 515211289906,4021634909249,77930896716918, 387592118891917,53467625139656294, 258820291307490689,2600667638804262010, 29899374277934530878] |