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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 42 |
| 4 | 441 |
| 5 | 4424 |
| 6 | 48335 |
| 7 | 542850 |
| 8 | 6285127 |
| 9 | 74286702 |
| 10 | 893407361 |
| 11 | 10894937088 |
| 12 | 134418087923 |
| 13 | 1674757658798 |
| 14 | 21042485711561 |
| 15 | 266318361927208 |
| 16 | 3392084001234202 |
| 17 | 43447635519011920 |
| 18 | 559277626577030221 |
[0,7,42,441,4424,48335,542850,6285127,74286702, 893407361,10894937088,134418087923,1674757658798, 21042485711561,266318361927208,3392084001234202, 43447635519011920,559277626577030221] |