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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 12 |
| 13 | 138 |
| 14 | 1152 |
| 15 | 8166 |
| 16 | 52098 |
| 17 | 308964 |
| 18 | 1733444 |
| 19 | 9311300 |
| 20 | 48280464 |
| 21 | 243112106 |
| 22 | 1194286106 |
| 23 | 5744306228 |
| 24 | 27129749648 |
| 25 | 126111332862 |
| 26 | 578106334718 |
| 27 | 2617667137358 |
| 28 | 11723920607410 |
| 29 | 51998857149406 |
| 30 | 228621028644376 |
| 31 | 997286152915772 |