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 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 4 |
| 12 | 41 |
| 13 | 346 |
| 14 | 2384 |
| 15 | 14560 |
| 16 | 81863 |
| 17 | 433172 |
| 18 | 2192752 |
| 19 | 10726252 |
| 20 | 51094203 |
| 21 | 238259280 |
| 22 | 1092053068 |
| 23 | 4934652298 |
| 24 | 22034767837 |
| 25 | 97407519119 |
| 26 | 426916828181 |