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 | 0 |
| 1 | 31 |
| 2 | 211 |
| 3 | 961 |
| 4 | 2851 |
| 5 | 7471 |
| 6 | 15541 |
| 7 | 31471 |
| 8 | 55651 |
| 9 | 95821 |
| 10 | 152041 |
| 11 | 239791 |
| 12 | 351331 |
| 13 | 517831 |
| 14 | 723241 |
| 15 | 1007041 |
| 16 | 1352041 |
| 17 | 1821721 |
| 18 | 2359051 |
| 19 | 3082921 |
| 20 | 3904081 |
| 21 | 4956901 |
| 22 | 6151651 |
| 23 | 7677901 |
| 24 | 9334261 |
| 25 | 11445361 |
| 26 | 13746181 |
| 27 | 16566691 |
| 28 | 19644031 |
| 29 | 23432851 |
| 30 | 27408331 |
| 31 | 32333581 |