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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 10 |
| 3 | 54 |
| 4 | 226 |
| 5 | 1198 |
| 6 | 6186 |
| 7 | 34182 |
| 8 | 190962 |
| 9 | 1096286 |
| 10 | 6377338 |
| 11 | 37652278 |
| 12 | 224654146 |
| 13 | 1353562766 |
| 14 | 8220739274 |
| 15 | 50284009702 |
| 16 | 309467901842 |
| 17 | 1915015423678 |
| 18 | 11907759661850 |
| 19 | 74365628891286 |
| 20 | 466240095217378 |
| 21 | 2933473106737902 |
[1,6,10,54,226,1198,6186,34182,190962,1096286, 6377338,37652278,224654146,1353562766,8220739274, 50284009702,309467901842,1915015423678, 11907759661850,74365628891286,466240095217378, 2933473106737902] |