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 | 13 |
| 2 | 65 |
| 3 | 88 |
| 4 | 235 |
| 5 | 1359 |
| 6 | 4231 |
| 7 | 12527 |
| 8 | 49454 |
| 9 | 179252 |
| 10 | 587281 |
| 11 | 2082252 |
| 12 | 7515919 |
| 13 | 25867500 |
| 14 | 90085908 |
| 15 | 319677011 |
| 16 | 1117899288 |
| 17 | 3899010020 |
| 18 | 13715991402 |
| 19 | 48120168332 |
| 20 | 168313465520 |
| 21 | 590354141418 |
| 22 | 2071069227598 |
| 23 | 7254935551371 |