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 | 4 |
| 2 | 12 |
| 3 | 60 |
| 4 | 292 |
| 5 | 1292 |
| 6 | 5012 |
| 7 | 16628 |
| 8 | 49236 |
| 9 | 127964 |
| 10 | 285740 |
| 11 | 546308 |
| 12 | 902056 |
| 13 | 1298248 |
| 14 | 1639652 |
| 15 | 1841556 |
| 16 | 1841556 |
| 17 | 1639652 |
| 18 | 1298248 |
| 19 | 902056 |
| 20 | 546308 |
| 21 | 285740 |
| 22 | 127964 |
| 23 | 49236 |
| 24 | 16628 |
| 25 | 5012 |
| 26 | 1292 |
| 27 | 292 |
| 28 | 60 |
| 29 | 12 |
| 30 | 4 |
| 31 | 1 |