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| n | a(n) |
|---|---|
| 1 | 22 |
| 2 | 126 |
| 3 | 956 |
| 4 | 6730 |
| 5 | 48490 |
| 6 | 346598 |
| 7 | 2486980 |
| 8 | 17808604 |
| 9 | 127696504 |
| 10 | 914844004 |
| 11 | 6558227280 |
| 12 | 46993954326 |
| 13 | 336844120550 |
| 14 | 2413933454878 |
| 15 | 17301596035866 |
| 16 | 123994418056868 |
| 17 | 888689321106698 |
| 18 | 6369062557713410 |
| 19 | 45647482408072212 |
[22,126,956,6730,48490,346598,2486980,17808604, 127696504,914844004,6558227280,46993954326, 336844120550,2413933454878,17301596035866, 123994418056868,888689321106698,6369062557713410, 45647482408072212] |