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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 17 |
| 4 | 99 |
| 5 | 2223 |
| 6 | 12039 |
| 7 | 56763 |
| 8 | 59337 |
| 9 | 286961 |
| 10 | 7358781 |
| 11 | 36088473 |
| 12 | 183146521 |
| 13 | 181066401 |
| 14 | 36534213 |
| 15 | 4535753121 |
| 16 | 22798981683 |
| 17 | 113528187171 |
| 18 | 113891192583 |
| 19 | 568042152363 |
| 20 | 14228623114839 |
| 21 | 71035463999307 |
| 22 | 355598139789279 |
| 23 | 14210752102407 |
| 24 | 1777633916948199 |