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 | 5 |
| 1 | 1 |
| 2 | 17 |
| 3 | 43 |
| 4 | 181 |
| 5 | 621 |
| 6 | 2309 |
| 7 | 8303 |
| 8 | 30277 |
| 9 | 109753 |
| 10 | 398857 |
| 11 | 1447931 |
| 12 | 5258725 |
| 13 | 19095285 |
| 14 | 69344061 |
| 15 | 251811903 |
| 16 | 914429445 |
| 17 | 3320635025 |
| 18 | 12058502657 |
| 19 | 43789003563 |
| 20 | 159014593621 |
| 21 | 577442573597 |
| 22 | 2096914206261 |
| 23 | 7614694850543 |
| 24 | 27651860345029 |
| 25 | 100414447219721 |
| 26 | 364643142303353 |