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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 53 |
| 3 | 164 |
| 4 | 485 |
| 5 | 1620 |
| 6 | 3981 |
| 7 | 9026 |
| 8 | 18009 |
| 9 | 31276 |
| 10 | 53643 |
| 11 | 83648 |
| 12 | 124019 |
| 13 | 177426 |
| 14 | 246495 |
| 15 | 341802 |
| 16 | 460879 |
| 17 | 604888 |
| 18 | 778121 |
| 19 | 983998 |
| 20 | 1248361 |
| 21 | 1556940 |
| 22 | 1913895 |
| 23 | 2325318 |
| 24 | 2796619 |
| 25 | 3361158 |
| 26 | 3997715 |
| 27 | 4713400 |
| 28 | 5516083 |
| 29 | 6407962 |
| 30 | 7439621 |
| 31 | 8580604 |
[2,53,164,485,1620,3981,9026,18009,31276,53643, 83648,124019,177426,246495,341802,460879,604888, 778121,983998,1248361,1556940,1913895,2325318, 2796619,3361158,3997715,4713400,5516083,6407962, 7439621,8580604] |