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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 7 |
| 7 | 3 |
| 8 | 18 |
| 9 | 59 |
| 10 | 101 |
| 11 | 262 |
| 12 | 700 |
| 13 | 1562 |
| 14 | 3662 |
| 15 | 9304 |
| 16 | 22659 |
| 17 | 54871 |
| 18 | 139034 |
| 19 | 355891 |
| 20 | 905047 |
| 21 | 2336089 |
| 22 | 6114813 |
| 23 | 16035466 |
| 24 | 42243825 |
| 25 | 112004236 |
| 26 | 297720737 |
| 27 | 792722328 |
| 28 | 2115471177 |
| 29 | 5653468757 |
| 30 | 15122594184 |
| 31 | 40493000308 |
[0,0,3,7,3,18,59,101,262,700,1562,3662,9304,22659, 54871,139034,355891,905047,2336089,6114813, 16035466,42243825,112004236,297720737,792722328, 2115471177,5653468757,15122594184,40493000308] |