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| n | a(n) |
|---|---|
| 1 | 642 |
| 2 | 2827 |
| 3 | 44729 |
| 4 | 316686 |
| 5 | 1432500 |
| 6 | 3500244 |
| 7 | 20832926 |
| 8 | 31561966 |
| 9 | 110467360 |
| 10 | 138633628 |
| 11 | 354021418 |
| 12 | 407664150 |
| 13 | 876980034 |
| 14 | 965635182 |
| 15 | 1845670842 |
| 16 | 1978943526 |
| 17 | 3471423154 |
| 18 | 3658918494 |
| 19 | 6009462826 |
| 20 | 6260785942 |
| 21 | 9758924834 |
| 22 | 10083680846 |
[642,2827,44729,316686,1432500,3500244,20832926, 31561966,110467360,138633628,354021418,407664150, 876980034,965635182,1845670842,1978943526, 3471423154,3658918494,6009462826,6260785942, 9758924834,10083680846] |