| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 7 |
| 7 | 8 |
| 8 | 18 |
| 9 | 22 |
| 10 | 46 |
| 11 | 62 |
| 12 | 136 |
| 13 | 189 |
| 14 | 409 |
| 15 | 611 |
| 16 | 1344 |
| 17 | 2055 |
| 18 | 4535 |
| 19 | 7154 |
| 20 | 15881 |
| 21 | 25481 |
| 22 | 56533 |
| 23 | 92204 |
| 24 | 204759 |
| 25 | 337593 |
| 26 | 748665 |
| 27 | 1246862 |
| 28 | 2762111 |
| 29 | 4636389 |
| 30 | 10253938 |
| 31 | 17334800 |
| 32 | 38278784 |
| 33 | 65108061 |
| 34 | 143534770 |
| 35 | 245492243 |
| 36 | 540353057 |
| 37 | 928772649 |
| 38 | 2041154125 |
[1,1,3,3,7,8,18,22,46,62,136,189,409,611,1344, 2055,4535,7154,15881,25481,56533,92204,204759, 337593,748665,1246862,2762111,4636389,10253938, 17334800,38278784,65108061,143534770,245492243, 540353057,928772649,2041154125] |