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 | 7 |
| 3 | 24 |
| 4 | 118 |
| 5 | 482 |
| 6 | 1999 |
| 7 | 8044 |
| 8 | 32035 |
| 9 | 126122 |
| 10 | 493267 |
| 11 | 1918884 |
| 12 | 7436318 |
| 13 | 28736532 |
| 14 | 110822456 |
| 15 | 426763772 |
| 16 | 1641751842 |
| 17 | 6311555602 |
| 18 | 24254371734 |
| 19 | 93187581596 |
| 20 | 358022612486 |
| 21 | 1375631211812 |
| 22 | 5286588768343 |
| 23 | 20321901846262 |
| 24 | 78143777698585 |