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 | 1 |
| 2 | 1028 |
| 3 | 59058 |
| 4 | 1052688 |
| 5 | 9765650 |
| 6 | 60711624 |
| 7 | 282475298 |
| 8 | 1077952576 |
| 9 | 3487315923 |
| 10 | 10039088200 |
| 11 | 25937424722 |
| 12 | 62169647904 |
| 13 | 137858492018 |
| 14 | 290384606344 |
| 15 | 576739757700 |
| 16 | 1103823438080 |
| 17 | 2015993900738 |
| 18 | 3584960768844 |
| 19 | 6131066258162 |
| 20 | 10280182567200 |
| 21 | 16682426149284 |
| 22 | 26663672614216 |