This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 39 |
| 5 | 87 |
| 6 | 102 |
| 7 | 267 |
| 8 | 507 |
| 9 | 582 |
| 10 | 699 |
| 11 | 1299 |
| 12 | 1830 |
| 13 | 2955 |
| 14 | 3975 |
| 15 | 4791 |
| 16 | 8691 |
| 17 | 12543 |
| 18 | 17223 |
| 19 | 19398 |
| 20 | 22683 |
| 21 | 27231 |
| 22 | 32838 |
| 23 | 44103 |
| 24 | 85971 |
| 25 | 100383 |
| 26 | 112998 |
| 27 | 129783 |
| 28 | 154923 |
| 29 | 186630 |
| 30 | 225075 |
| 31 | 289671 |
| 32 | 405411 |
| 33 | 585075 |
| 34 | 589254 |
| 35 | 884055 |
| 36 | 1279167 |
| 37 | 1498179 |
| 38 | 1542687 |
| 39 | 1938054 |
| 40 | 2777295 |
| 41 | 3410067 |
| 42 | 3836454 |