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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 243 |
| 4 | 2973 |
| 5 | 41676 |
| 6 | 652662 |
| 7 | 11228556 |
| 8 | 209674050 |
| 9 | 4211011422 |
| 10 | 90309000630 |
| 11 | 2056139084544 |
| 12 | 49460437075896 |
| 13 | 1251936022103679 |
| 14 | 33228751234896060 |
| 15 | 922028391785300940 |
| 16 | 26676362307801924057 |
| 17 | 802875670635086298600 |
[1,3,24,243,2973,41676,652662,11228556,209674050, 4211011422,90309000630,2056139084544, 49460437075896,1251936022103679,33228751234896060, 922028391785300940,26676362307801924057, 802875670635086298600] |