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| n | a(n) |
|---|---|
| 4 | 38 |
| 5 | 134 |
| 6 | 462 |
| 7 | 1582 |
| 8 | 5406 |
| 9 | 18462 |
| 10 | 63038 |
| 11 | 215230 |
| 12 | 734846 |
| 13 | 2508926 |
| 14 | 8566014 |
| 15 | 29246206 |
| 16 | 99852798 |
| 17 | 340918782 |
| 18 | 1163969534 |
| 19 | 3974040574 |
| 20 | 13568223230 |
| 21 | 46324811774 |
| 22 | 158162800638 |
| 23 | 540001579006 |
| 24 | 1843680714750 |
| 25 | 6294719700990 |
| 26 | 21491517374462 |
| 27 | 73376630095870 |
| 28 | 250523485634558 |
[38,134,462,1582,5406,18462,63038,215230,734846, 2508926,8566014,29246206,99852798,340918782, 1163969534,3974040574,13568223230,46324811774, 158162800638,540001579006,1843680714750, 6294719700990,21491517374462,73376630095870, 250523485634558] |