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 | 23 |
| 1 | 39 |
| 2 | 99 |
| 3 | 279 |
| 4 | 775 |
| 5 | 1271 |
| 6 | 3003 |
| 7 | 26411 |
| 8 | 45059 |
| 9 | 53219 |
| 10 | 96811 |
| 11 | 180063 |
| 12 | 538083 |
| 13 | 1557987 |
| 14 | 2994571 |
| 15 | 5394027 |
| 16 | 76600323 |
| 17 | 78603291 |
| 18 | 646326135 |
| 19 | 5260930155 |
| 20 | 11705029515 |
| 21 | 55771437087 |
| 22 | 918661840551 |
| 23 | 2662267345431 |
| 24 | 156054629431431 |
| 25 | 1885162669463151 |
| 26 | 2739827178329319 |
| 27 | 23916267980687775 |
| 28 | 343334160580618935 |