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 | 3 |
| 2 | 23 |
| 3 | 23 |
| 4 | 85 |
| 5 | 179 |
| 6 | 453 |
| 7 | 1006 |
| 8 | 2523 |
| 9 | 6002 |
| 10 | 14802 |
| 11 | 36299 |
| 12 | 87591 |
| 13 | 214486 |
| 14 | 522937 |
| 15 | 1275628 |
| 16 | 3120041 |
| 17 | 7614933 |
| 18 | 18586581 |
| 19 | 45384416 |
| 20 | 110821038 |
| 21 | 270585507 |
| 22 | 660827950 |
| 23 | 1613737854 |
| 24 | 3940683638 |
| 25 | 9622959317 |
| 26 | 23498981429 |
| 27 | 57383159995 |
| 28 | 140126697433 |