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) |
|---|---|
| 3 | 50 |
| 4 | 272 |
| 5 | 722 |
| 6 | 3108 |
| 7 | 10082 |
| 8 | 39952 |
| 9 | 140450 |
| 10 | 537636 |
| 11 | 1956242 |
| 12 | 7379216 |
| 13 | 27246962 |
| 14 | 102144036 |
| 15 | 379501250 |
| 16 | 1418981392 |
| 17 | 5285770562 |
| 18 | 19742287908 |
| 19 | 73621286642 |
| 20 | 274848860432 |
| 21 | 1025412242450 |
| 22 | 3827417932836 |
| 23 | 14282150107682 |
| 24 | 53304783436816 |
| 25 | 198924689265122 |
| 26 | 742414961433636 |
| 27 | 2770663499604050 |
| 28 | 10340361362903312 |