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 | 3 |
| 2 | 7 |
| 3 | 14 |
| 4 | 42 |
| 5 | 99 |
| 6 | 259 |
| 7 | 719 |
| 8 | 1784 |
| 9 | 4792 |
| 10 | 12479 |
| 11 | 32263 |
| 12 | 86025 |
| 13 | 222663 |
| 14 | 585072 |
| 15 | 1535472 |
| 16 | 4002444 |
| 17 | 10527738 |
| 18 | 27516774 |
| 19 | 72060109 |
| 20 | 188952481 |
| 21 | 494214824 |
| 22 | 1295507675 |
| 23 | 3392305134 |
| 24 | 8882420053 |
| 25 | 23272852966 |
| 26 | 60933892273 |
| 27 | 159611564865 |
| 28 | 418043981246 |