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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 100 |
| 4 | 373 |
| 5 | 999 |
| 6 | 2393 |
| 7 | 4795 |
| 8 | 9164 |
| 9 | 15807 |
| 10 | 26449 |
| 11 | 41091 |
| 12 | 63477 |
| 13 | 92039 |
| 14 | 132873 |
| 15 | 184205 |
| 16 | 254110 |
| 17 | 337632 |
| 18 | 450563 |
| 19 | 580885 |
| 20 | 751783 |
| 21 | 948747 |
| 22 | 1197661 |
| 23 | 1477503 |
| 24 | 1835761 |
| 25 | 2227012 |
| 26 | 2712566 |
| 27 | 3250650 |
| 28 | 3906396 |
| 29 | 4613678 |
| 30 | 5486322 |
| 31 | 6409844 |
[1,18,100,373,999,2393,4795,9164,15807,26449, 41091,63477,92039,132873,184205,254110,337632, 450563,580885,751783,948747,1197661,1477503, 1835761,2227012,2712566,3250650,3906396,4613678, 5486322,6409844] |