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 | 4 |
| 3 | 17 |
| 4 | 52 |
| 5 | 139 |
| 6 | 346 |
| 7 | 825 |
| 8 | 1912 |
| 9 | 4343 |
| 10 | 9718 |
| 11 | 21493 |
| 12 | 47092 |
| 13 | 102387 |
| 14 | 221170 |
| 15 | 475121 |
| 16 | 1015792 |
| 17 | 2162671 |
| 18 | 4587502 |
| 19 | 9699309 |
| 20 | 20447212 |
| 21 | 42991595 |
| 22 | 90177514 |
| 23 | 188743657 |
| 24 | 394264552 |
| 25 | 822083559 |
| 26 | 1711276006 |
| 27 | 3556769765 |
| 28 | 7381975012 |