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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 6 |
| 8 | 6 |
| 9 | 25 |
| 10 | 24 |
| 11 | 90 |
| 12 | 89 |
| 13 | 301 |
| 14 | 295 |
| 15 | 965 |
| 16 | 960 |
| 17 | 3025 |
| 18 | 2999 |
| 19 | 9330 |
| 20 | 9305 |
| 21 | 28495 |
| 22 | 28411 |
| 23 | 86526 |
| 24 | 86430 |
| 25 | 261624 |
| 26 | 261324 |
| 27 | 788945 |
| 28 | 788669 |
| 29 | 2375101 |
| 30 | 2374110 |
| 31 | 7141686 |