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 | 135 |
| 2 | 819 |
| 3 | 3375 |
| 4 | 6975 |
| 5 | 25137 |
| 6 | 40131 |
| 7 | 68607 |
| 8 | 154791 |
| 9 | 22113 |
| 10 | 448335 |
| 11 | 557375 |
| 12 | 721525 |
| 13 | 451737 |
| 14 | 1401543 |
| 15 | 1278316 |
| 16 | 1680705 |
| 17 | 273 |
| 18 | 2876211 |
| 19 | 6739509 |
| 20 | 10590125 |
| 21 | 188325 |
| 22 | 11208375 |
| 23 | 8775 |
| 24 | 12525435 |
| 25 | 9020375 |
| 26 | 13934375 |
| 27 | 20365625 |
| 28 | 56162575 |
| 29 | 1083537 |
| 30 | 83479977 |
| 31 | 3416875 |