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| n | a(n) |
|---|---|
| 1 | 156 |
| 2 | 549 |
| 3 | 2438 |
| 4 | 8699 |
| 5 | 30351 |
| 6 | 115410 |
| 7 | 438353 |
| 8 | 1615572 |
| 9 | 5983278 |
| 10 | 22387088 |
| 11 | 83497726 |
| 12 | 310419235 |
| 13 | 1155916673 |
| 14 | 4308316980 |
| 15 | 16046423584 |
| 16 | 59751346761 |
| 17 | 222558385418 |
| 18 | 829007147866 |
| 19 | 3087623758483 |
| 20 | 11499815151619 |
| 21 | 42832625165165 |
[156,549,2438,8699,30351,115410,438353,1615572, 5983278,22387088,83497726,310419235,1155916673, 4308316980,16046423584,59751346761,222558385418, 829007147866,3087623758483,11499815151619, 42832625165165] |