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 | 28 |
| 11 | 4842 |
| 12 | 104448 |
| 13 | 1127473 |
| 14 | 8147469 |
| 15 | 44813100 |
| 16 | 201616740 |
| 17 | 776296572 |
| 18 | 2638333236 |
| 19 | 8091512680 |
| 20 | 22767562704 |
| 21 | 59525327634 |
| 22 | 146063694310 |
| 23 | 339101167392 |
| 24 | 749761416480 |
| 25 | 1587403977944 |
| 26 | 3233026755180 |
| 27 | 6358705091310 |