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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 18 |
| 6 | 21 |
| 7 | 36 |
| 8 | 58 |
| 9 | 68 |
| 10 | 78 |
| 11 | 84 |
| 12 | 94 |
| 13 | 150 |
| 14 | 178 |
| 15 | 190 |
| 16 | 591 |
| 17 | 686 |
| 18 | 812 |
| 19 | 840 |
| 20 | 2308 |
| 21 | 2530 |
| 22 | 2884 |
| 23 | 4311 |
| 24 | 6134 |
| 25 | 7695 |
| 26 | 8004 |
| 27 | 8109 |
| 28 | 9777 |
| 29 | 15570 |
| 30 | 17505 |
[0,2,3,4,18,21,36,58,68,78,84,94,150,178,190,591, 686,812,840,2308,2530,2884,4311,6134,7695,8004, 8109,9777,15570,17505] |