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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 29 |
| 3 | 255 |
| 4 | 1114 |
| 5 | 4549 |
| 6 | 28184 |
| 7 | 125255 |
| 8 | 860559 |
| 9 | 4802971 |
| 10 | 24477675 |
| 11 | 167075425 |
| 12 | 824227912 |
| 13 | 4838346333 |
| 14 | 28474926407 |
| 15 | 141317949021 |
| 16 | 883311612241 |
| 17 | 4759951691561 |
| 18 | 26045766222755 |
| 19 | 156842648720379 |
| 20 | 819459824961446 |
[8,29,255,1114,4549,28184,125255,860559,4802971, 24477675,167075425,824227912,4838346333, 28474926407,141317949021,883311612241, 4759951691561,26045766222755,156842648720379, 819459824961446] |