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 | 3 |
| 3 | 4 |
| 4 | 14 |
| 5 | 21 |
| 6 | 53 |
| 7 | 69 |
| 8 | 237 |
| 9 | 321 |
| 10 | 867 |
| 11 | 1044 |
| 12 | 3638 |
| 13 | 5441 |
| 14 | 13667 |
| 15 | 17684 |
| 16 | 60854 |
| 17 | 81921 |
| 18 | 221187 |
| 19 | 266244 |
| 20 | 931854 |
| 21 | 1397781 |
| 22 | 3495477 |
| 23 | 4542789 |
| 24 | 15555437 |
| 25 | 21053441 |