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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 18 |
| 6 | 55 |
| 7 | 169 |
| 8 | 477 |
| 9 | 1245 |
| 10 | 2750 |
| 11 | 5380 |
| 12 | 8989 |
| 13 | 12674 |
| 14 | 14741 |
| 15 | 13928 |
| 16 | 10297 |
| 17 | 6185 |
| 18 | 2910 |
| 19 | 1012 |
| 20 | 289 |
| 21 | 69 |
| 22 | 12 |
| 23 | 2 |