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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 56 |
| 3 | 1341 |
| 4 | 29363 |
| 5 | 537572 |
| 6 | 8249505 |
| 7 | 108479344 |
| 8 | 1248911674 |
| 9 | 12812139620 |
| 10 | 118772002152 |
| 11 | 1006266126267 |
| 12 | 7863720278445 |
| 13 | 57120674129416 |
| 14 | 388168845356086 |
| 15 | 2481485055755353 |
| 16 | 14994743673623870 |
| 17 | 86001919259575522 |
| 18 | 469898358909610160 |
[3,56,1341,29363,537572,8249505,108479344, 1248911674,12812139620,118772002152,1006266126267, 7863720278445,57120674129416,388168845356086, 2481485055755353,14994743673623870, 86001919259575522,469898358909610160] |