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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 17 |
| 6 | 18 |
| 7 | 22 |
| 8 | 23 |
| 9 | 33 |
| 10 | 40 |
| 11 | 55 |
| 12 | 63 |
| 13 | 83 |
| 14 | 148 |
| 15 | 271 |
| 16 | 754 |
| 17 | 1271 |
| 18 | 2397 |
| 19 | 2685 |
| 20 | 4799 |
| 21 | 5197 |
| 22 | 6216 |
| 23 | 8736 |
| 24 | 12387 |
| 25 | 12390 |
| 26 | 19701 |
| 27 | 42403 |
[0,1,3,6,17,18,22,23,33,40,55,63,83,148,271,754, 1271,2397,2685,4799,5197,6216,8736,12387,12390, 19701,42403] |