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 | 4 |
| 2 | 13 |
| 3 | 37 |
| 4 | 105 |
| 5 | 298 |
| 6 | 848 |
| 7 | 2419 |
| 8 | 6908 |
| 9 | 19737 |
| 10 | 56401 |
| 11 | 161181 |
| 12 | 460622 |
| 13 | 1316360 |
| 14 | 3761867 |
| 15 | 10750568 |
| 16 | 30722673 |
| 17 | 87798365 |
| 18 | 250907593 |
| 19 | 717036338 |
| 20 | 2049125344 |
| 21 | 5855930115 |
| 22 | 16734904820 |
| 23 | 47824518777 |
| 24 | 136671503209 |
| 25 | 390575802373 |
| 26 | 1116176041318 |