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 | 6 |
| 2 | 21 |
| 3 | 105 |
| 4 | 301 |
| 5 | 1221 |
| 6 | 2041 |
| 7 | 4641 |
| 8 | 6517 |
| 9 | 11661 |
| 10 | 23577 |
| 11 | 28861 |
| 12 | 49321 |
| 13 | 67281 |
| 14 | 77701 |
| 15 | 101661 |
| 16 | 146121 |
| 17 | 201957 |
| 18 | 223321 |
| 19 | 296341 |
| 20 | 352941 |
| 21 | 383761 |
| 22 | 486877 |
| 23 | 564981 |
| 24 | 697137 |
| 25 | 903361 |
| 26 | 1020201 |
| 27 | 1082221 |
| 28 | 1213701 |
| 29 | 1283257 |
| 30 | 1430241 |
| 31 | 2032381 |
| 32 | 2231061 |
| 33 | 2552721 |
| 34 | 2666437 |