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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 15 |
| 5 | 18 |
| 6 | 26 |
| 7 | 51 |
| 8 | 75 |
| 9 | 86 |
| 10 | 114 |
| 11 | 257 |
| 12 | 275 |
| 13 | 537 |
| 14 | 753 |
| 15 | 914 |
| 16 | 1944 |
| 17 | 18431 |
| 18 | 18741 |
| 19 | 21281 |
| 20 | 28272 |
| 21 | 31002 |
| 22 | 71621 |
| 23 | 84170 |
| 24 | 110961 |
[0,2,6,15,18,26,51,75,86,114,257,275,537,753,914, 1944,18431,18741,21281,28272,31002,71621,84170, 110961] |