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 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 22 |
| 6 | 57 |
| 7 | 165 |
| 8 | 534 |
| 9 | 1819 |
| 10 | 6474 |
| 11 | 23547 |
| 12 | 87147 |
| 13 | 325738 |
| 14 | 1227709 |
| 15 | 4654285 |
| 16 | 17733540 |
| 17 | 67841449 |
| 18 | 260463501 |
| 19 | 1003087733 |
| 20 | 3873759683 |
| 21 | 14996820361 |
| 22 | 58188678049 |
| 23 | 226235685777 |
| 24 | 881235386180 |
| 25 | 3438462430944 |
| 26 | 13437551253019 |