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 | 7 |
| 4 | 31 |
| 5 | 100 |
| 6 | 331 |
| 7 | 431 |
| 8 | 2486 |
| 9 | 2917 |
| 10 | 5403 |
| 11 | 24529 |
| 12 | 250693 |
| 13 | 4286310 |
| 14 | 4537003 |
| 15 | 67804352 |
| 16 | 72341355 |
| 17 | 140145707 |
| 18 | 427797039119 |
| 19 | 427937184826 |
| 20 | 855734223945 |
| 21 | 1283671408771 |
| 22 | 2139405632716 |
| 23 | 3423077041487 |
| 24 | 5562482674203 |
| 25 | 14548042389893 |