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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 21 |
| 3 | 245 |
| 4 | 2487 |
| 5 | 24794 |
| 6 | 247544 |
| 7 | 2476736 |
| 8 | 24760667 |
| 9 | 247610954 |
| 10 | 2476238920 |
| 11 | 24761949212 |
| 12 | 247617948446 |
| 13 | 2476198914588 |
| 14 | 24762008009145 |
| 15 | 247619645317536 |
| 16 | 2476194603970937 |
| 17 | 24761962442728106 |
[0,21,245,2487,24794,247544,2476736,24760667, 247610954,2476238920,24761949212,247617948446, 2476198914588,24762008009145,247619645317536, 2476194603970937,24761962442728106] |