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 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 146 |
| 5 | 627 |
| 6 | 2689 |
| 7 | 11521 |
| 8 | 49337 |
| 9 | 211233 |
| 10 | 904306 |
| 11 | 3871305 |
| 12 | 16572812 |
| 13 | 70947073 |
| 14 | 303719624 |
| 15 | 1300203634 |
| 16 | 5566087073 |
| 17 | 23828058969 |
| 18 | 102006385362 |
| 19 | 436682772844 |
| 20 | 1869410868456 |
| 21 | 8002827727921 |
| 22 | 34259590954322 |