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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 10 |
| 3 | 38 |
| 4 | 142 |
| 5 | 542 |
| 6 | 2110 |
| 7 | 8318 |
| 8 | 33022 |
| 9 | 131582 |
| 10 | 525310 |
| 11 | 2099198 |
| 12 | 8392702 |
| 13 | 33562622 |
| 14 | 134234110 |
| 15 | 536903678 |
| 16 | 2147549182 |
| 17 | 8590065662 |
| 18 | 34360000510 |
| 19 | 137439477758 |
| 20 | 549756862462 |
| 21 | 2199025352702 |
| 22 | 8796097216510 |
| 23 | 35184380477438 |
| 24 | 140737505132542 |
| 25 | 562949986975742 |
[2,10,38,142,542,2110,8318,33022,131582,525310, 2099198,8392702,33562622,134234110,536903678, 2147549182,8590065662,34360000510,137439477758, 549756862462,2199025352702,8796097216510, 35184380477438,140737505132542,562949986975742] |