| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 12 |
| 4 | 24 |
| 5 | 54 |
| 6 | 108 |
| 7 | 213 |
| 8 | 405 |
| 9 | 756 |
| 10 | 1386 |
| 11 | 2508 |
| 12 | 4488 |
| 13 | 7959 |
| 14 | 14007 |
| 15 | 24492 |
| 16 | 42588 |
| 17 | 73698 |
| 18 | 126996 |
| 19 | 218025 |
| 20 | 373065 |
| 21 | 636468 |
| 22 | 1082958 |
| 23 | 1838232 |
| 24 | 3113424 |
| 25 | 5262699 |
| 26 | 8879403 |
| 27 | 14956428 |
| 28 | 25153440 |
| 29 | 42241806 |
| 30 | 70844796 |
[3,3,12,24,54,108,213,405,756,1386,2508,4488,7959, 14007,24492,42588,73698,126996,218025,373065, 636468,1082958,1838232,3113424,5262699,8879403, 14956428,25153440,42241806,70844796] |