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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 21 |
| 6 | 40 |
| 7 | 63 |
| 8 | 105 |
| 9 | 159 |
| 10 | 245 |
| 11 | 355 |
| 12 | 526 |
| 13 | 739 |
| 14 | 1052 |
| 15 | 1452 |
| 16 | 2011 |
| 17 | 2718 |
| 18 | 3691 |
| 19 | 4909 |
| 20 | 6546 |
[0,1,2,5,12,21,40,63,105,159,245,355,526,739,1052, 1452,2011,2718,3691,4909,6546] |