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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 37 |
| 3 | 157 |
| 4 | 585 |
| 5 | 3775 |
| 6 | 21087 |
| 7 | 108933 |
| 8 | 605121 |
| 9 | 3383481 |
| 10 | 18933967 |
| 11 | 108596954 |
| 12 | 621307251 |
| 13 | 3596674404 |
| 14 | 21361372274 |
| 15 | 126467308667 |
| 16 | 755919541074 |
| 17 | 4613926900275 |
| 18 | 28140294521457 |
| 19 | 172868292897945 |
| 20 | 1077086719344405 |
[1,37,157,585,3775,21087,108933,605121,3383481, 18933967,108596954,621307251,3596674404, 21361372274,126467308667,755919541074, 4613926900275,28140294521457,172868292897945, 1077086719344405] |