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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 208 |
| 3 | 2076 |
| 4 | 18369 |
| 5 | 158109 |
| 6 | 1317780 |
| 7 | 10791350 |
| 8 | 87194833 |
| 9 | 698250904 |
| 10 | 5555688785 |
| 11 | 44005119429 |
| 12 | 347432212188 |
| 13 | 2736799922735 |
| 14 | 21523189213085 |
| 15 | 169068961542156 |
| 16 | 1326964403390558 |
| 17 | 10408686351322363 |
| 18 | 81610767953922967 |
| 19 | 639685545725575292 |
[23,208,2076,18369,158109,1317780,10791350, 87194833,698250904,5555688785,44005119429, 347432212188,2736799922735,21523189213085, 169068961542156,1326964403390558, 10408686351322363,81610767953922967, 639685545725575292] |