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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 65 |
| 3 | 534 |
| 4 | 4421 |
| 5 | 36796 |
| 6 | 307357 |
| 7 | 2573586 |
| 8 | 21584425 |
| 9 | 181223408 |
| 10 | 1522659737 |
| 11 | 12799736142 |
| 12 | 107631298349 |
| 13 | 905250578212 |
| 14 | 7614837072565 |
| 15 | 64060941839946 |
| 16 | 538955843348689 |
| 17 | 4534517540404184 |
| 18 | 38152320928270193 |
| 19 | 321010168596786054 |
[1,8,65,534,4421,36796,307357,2573586,21584425, 181223408,1522659737,12799736142,107631298349, 905250578212,7614837072565,64060941839946, 538955843348689,4534517540404184, 38152320928270193,321010168596786054] |