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 | 1 |
| 2 | 7 |
| 3 | 26 |
| 4 | 79 |
| 5 | 221 |
| 6 | 596 |
| 7 | 1581 |
| 8 | 4163 |
| 9 | 10926 |
| 10 | 28635 |
| 11 | 75001 |
| 12 | 196392 |
| 13 | 514201 |
| 14 | 1346239 |
| 15 | 3524546 |
| 16 | 9227431 |
| 17 | 24157781 |
| 18 | 63245948 |
| 19 | 165580101 |
| 20 | 433494395 |
| 21 | 1134903126 |
| 22 | 2971215027 |
| 23 | 7778742001 |
| 24 | 20365011024 |
| 25 | 53316291121 |