| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 22 |
| 7 | 68 |
| 8 | 70 |
| 9 | 109 |
| 10 | 112 |
| 11 | 144 |
| 12 | 154 |
| 13 | 318 |
| 14 | 418 |
| 15 | 451 |
| 16 | 536 |
| 17 | 638 |
| 18 | 1540 |
| 19 | 1590 |
| 20 | 2935 |
| 21 | 3859 |
| 22 | 8770 |
| 23 | 9860 |
| 24 | 70688 |
| 25 | 133955 |
| 26 | 161766 |
| 27 | 166458 |
[0,1,2,4,8,22,68,70,109,112,144,154,318,418,451, 536,638,1540,1590,2935,3859,8770,9860,70688, 133955,161766,166458] |