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| n | a(n) |
|---|---|
| 0 | 6 |
| 1 | 31 |
| 2 | 160 |
| 3 | 825 |
| 4 | 4253 |
| 5 | 21924 |
| 6 | 113017 |
| 7 | 582596 |
| 8 | 3003248 |
| 9 | 15481566 |
| 10 | 79806558 |
| 11 | 411398091 |
| 12 | 2120732851 |
| 13 | 10932252540 |
| 14 | 56355115894 |
| 15 | 290507292601 |
| 16 | 1497547928268 |
| 17 | 7719771085196 |
| 18 | 39794963809107 |
| 19 | 205140687086569 |
| 20 | 1057488120864155 |
| 21 | 5451288779669969 |
| 22 | 28101071561042234 |
[6,31,160,825,4253,21924,113017,582596,3003248, 15481566,79806558,411398091,2120732851, 10932252540,56355115894,290507292601, 1497547928268,7719771085196,39794963809107, 205140687086569,1057488120864155,5451288779669969, 28101071561042234] |