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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 26 |
| 3 | 127 |
| 4 | 636 |
| 5 | 3153 |
| 6 | 15727 |
| 7 | 78406 |
| 8 | 391494 |
| 9 | 1955563 |
| 10 | 9772721 |
| 11 | 48847892 |
| 12 | 244196337 |
| 13 | 1220857221 |
| 14 | 6103941997 |
| 15 | 30518746918 |
| 16 | 152591088797 |
| 17 | 762948154799 |
| 18 | 3814720881833 |
| 19 | 19073550187976 |
| 20 | 95367603900506 |
| 21 | 476837621600990 |
| 22 | 2384187034951204 |
| 23 | 11920932287085421 |
| 24 | 59604653684027019 |
[1,5,26,127,636,3153,15727,78406,391494,1955563, 9772721,48847892,244196337,1220857221,6103941997, 30518746918,152591088797,762948154799, 3814720881833,19073550187976,95367603900506, 476837621600990,2384187034951204, 11920932287085421,59604653684027019] |