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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 11 |
| 6 | 97 |
| 7 | 159 |
| 8 | 159 |
| 9 | 187 |
| 10 | 1777 |
| 11 | 1777 |
| 12 | 26181 |
| 13 | 23321 |
| 14 | 23321 |
| 15 | 51647 |
| 16 | 797919 |
| 17 | 797919 |
| 18 | 16521821 |
| 19 | 15228529 |
| 20 | 15228529 |
| 21 | 16404249 |
| 22 | 351431887 |
| 23 | 351431887 |
| 24 | 1876142299 |
| 25 | 1761735699 |
| 26 | 1761735699 |
| 27 | 1867970399 |
| 28 | 51196569971 |
| 29 | 51196569971 |