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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 58 |
| 5 | 182 |
| 6 | 457 |
| 7 | 1433 |
| 8 | 3598 |
| 9 | 11282 |
| 10 | 28327 |
| 11 | 88823 |
| 12 | 223018 |
| 13 | 699302 |
| 14 | 1755817 |
| 15 | 5505593 |
| 16 | 13823518 |
| 17 | 43345442 |
| 18 | 108832327 |
| 19 | 341257943 |
| 20 | 856835098 |
| 21 | 2686718102 |
| 22 | 6745848457 |
| 23 | 21152486873 |
| 24 | 53109952558 |
| 25 | 166533176882 |
| 26 | 418133772007 |
| 27 | 1311112928183 |
| 28 | 3291960223498 |
[2,7,23,58,182,457,1433,3598,11282,28327,88823, 223018,699302,1755817,5505593,13823518,43345442, 108832327,341257943,856835098,2686718102, 6745848457,21152486873,53109952558,166533176882, 418133772007,1311112928183,3291960223498] |