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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 36 |
| 5 | 137 |
| 6 | 543 |
| 7 | 2219 |
| 8 | 9285 |
| 9 | 39587 |
| 10 | 171369 |
| 11 | 751236 |
| 12 | 3328218 |
| 13 | 14878455 |
| 14 | 67030785 |
| 15 | 304036170 |
| 16 | 1387247580 |
| 17 | 6363044315 |
| 18 | 29323149825 |
| 19 | 135700543190 |
| 20 | 630375241380 |
| 21 | 2938391049395 |
| 22 | 13739779184085 |
| 23 | 64430797069375 |
| 24 | 302934667061301 |
| 25 | 1427763630578197 |