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 | 4 |
| 1 | 18 |
| 2 | 83 |
| 3 | 385 |
| 4 | 1788 |
| 5 | 8306 |
| 6 | 38587 |
| 7 | 179265 |
| 8 | 832820 |
| 9 | 3869074 |
| 10 | 17974755 |
| 11 | 83506241 |
| 12 | 387949228 |
| 13 | 1802315634 |
| 14 | 8373110219 |
| 15 | 38899387777 |
| 16 | 180716881764 |
| 17 | 839565690386 |
| 18 | 3900413406835 |
| 19 | 18120350698497 |
| 20 | 84182643014492 |
| 21 | 391091624153458 |
| 22 | 1816914425657307 |
| 23 | 8440932575089601 |