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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 5 |
| 6 | 4 |
| 7 | 12 |
| 8 | 34 |
| 9 | 54 |
| 10 | 152 |
| 11 | 360 |
| 12 | 669 |
| 13 | 1661 |
| 14 | 3856 |
| 15 | 8167 |
| 16 | 19462 |
| 17 | 45722 |
| 18 | 105386 |
| 19 | 255448 |
| 20 | 624360 |
| 21 | 1549315 |
| 22 | 3945767 |
| 23 | 10147944 |
| 24 | 26472937 |
| 25 | 69822227 |
| 26 | 185025991 |
| 27 | 492510221 |
| 28 | 1313320180 |
| 29 | 3501289056 |
[0,0,5,4,12,34,54,152,360,669,1661,3856,8167, 19462,45722,105386,255448,624360,1549315,3945767, 10147944,26472937,69822227,185025991,492510221, 1313320180,3501289056] |