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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 13 |
| 3 | 44 |
| 4 | 162 |
| 5 | 637 |
| 6 | 2622 |
| 7 | 11188 |
| 8 | 49293 |
| 9 | 223768 |
| 10 | 1044661 |
| 11 | 5006126 |
| 12 | 24580704 |
| 13 | 123464593 |
| 14 | 633467893 |
| 15 | 3315948760 |
| 16 | 17690431736 |
| 17 | 96101620364 |
| 18 | 531196784996 |
| 19 | 2985589206506 |
| 20 | 17053375055317 |
| 21 | 98942675518256 |
| 22 | 582858713958087 |
[1,4,13,44,162,637,2622,11188,49293,223768, 1044661,5006126,24580704,123464593,633467893, 3315948760,17690431736,96101620364,531196784996, 2985589206506,17053375055317,98942675518256, 582858713958087] |