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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 43 |
| 3 | 269 |
| 4 | 1679 |
| 5 | 10483 |
| 6 | 65449 |
| 7 | 408623 |
| 8 | 2551187 |
| 9 | 15928021 |
| 10 | 99444631 |
| 11 | 620870267 |
| 12 | 3876326801 |
| 13 | 24201367447 |
| 14 | 151098247483 |
| 15 | 943363239389 |
| 16 | 5889771828959 |
| 17 | 36772062710083 |
| 18 | 229581830200249 |
| 19 | 1433365791134783 |
[1,7,43,269,1679,10483,65449,408623,2551187, 15928021,99444631,620870267,3876326801, 24201367447,151098247483,943363239389, 5889771828959,36772062710083,229581830200249, 1433365791134783] |