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 | 16 |
| 3 | 1393 |
| 4 | 26481 |
| 5 | 247731 |
| 6 | 1516515 |
| 7 | 6978790 |
| 8 | 26131686 |
| 9 | 83684778 |
| 10 | 237014778 |
| 11 | 607915231 |
| 12 | 1436816095 |
| 13 | 3170754405 |
| 14 | 6600189141 |
| 15 | 13064343516 |
| 16 | 24750198748 |
| 17 | 45116627556 |
| 18 | 79482515700 |
| 19 | 135826148445 |
| 20 | 225852708445 |
| 21 | 366397514791 |
| 22 | 581244702423 |
| 23 | 903454469346 |
| 24 | 1378306878690 |
| 25 | 2066986566190 |