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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 8 |
| 6 | 26 |
| 7 | 33 |
| 8 | 64 |
| 9 | 116 |
| 10 | 201 |
| 11 | 1278 |
| 12 | 1927 |
| 13 | 2549 |
| 14 | 4054 |
| 15 | 5379 |
| 16 | 5704 |
| 17 | 6639 |
| 18 | 13785 |
| 19 | 18918 |
| 20 | 19085 |
[0,1,4,7,8,26,33,64,116,201,1278,1927,2549,4054, 5379,5704,6639,13785,18918,19085] |