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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 23 |
| 5 | 44 |
| 6 | 80 |
| 7 | 142 |
| 8 | 247 |
| 9 | 411 |
| 10 | 662 |
| 11 | 1019 |
| 12 | 1481 |
| 13 | 2059 |
| 14 | 2745 |
| 15 | 3465 |
| 16 | 4126 |
| 17 | 4633 |
| 18 | 4913 |
| 19 | 4777 |
| 20 | 4163 |
| 21 | 3079 |
| 22 | 1612 |
| 23 | 488 |
| 24 | 94 |
| 25 | 25 |
| 26 | 6 |
| 27 | 3 |
| 28 | 1 |
[1,3,6,12,23,44,80,142,247,411,662,1019,1481,2059, 2745,3465,4126,4633,4913,4777,4163,3079,1612,488, 94,25,6,3,1] |