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 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 1 |
| 7 | 7 |
| 8 | 18 |
| 9 | 8 |
| 10 | 1 |
| 11 | 15 |
| 12 | 99 |
| 13 | 64 |
| 14 | 30 |
| 15 | 1 |
| 16 | 31 |
| 17 | 510 |
| 18 | 560 |
| 19 | 300 |
| 20 | 144 |
| 21 | 1 |
| 22 | 63 |
| 23 | 2745 |
| 24 | 4800 |
| 25 | 3150 |
| 26 | 1728 |
| 27 | 840 |