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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 158 |
| 4 | 1911 |
| 5 | 23105 |
| 6 | 279344 |
| 7 | 3377317 |
| 8 | 40832337 |
| 9 | 493669894 |
| 10 | 5968552915 |
| 11 | 72160819061 |
| 12 | 872436565728 |
| 13 | 10547906344793 |
| 14 | 127525980259301 |
| 15 | 1541810773578190 |
| 16 | 18640754273664159 |
| 17 | 225369887048273977 |
[0,1,13,158,1911,23105,279344,3377317,40832337, 493669894,5968552915,72160819061,872436565728, 10547906344793,127525980259301,1541810773578190, 18640754273664159,225369887048273977] |