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) |
|---|---|
| 2 | 16 |
| 3 | 281 |
| 4 | 1785 |
| 5 | 7175 |
| 6 | 22015 |
| 7 | 56406 |
| 8 | 126966 |
| 9 | 259170 |
| 10 | 490050 |
| 11 | 871255 |
| 12 | 1472471 |
| 13 | 2385201 |
| 14 | 3726905 |
| 15 | 5645500 |
| 16 | 8324220 |
| 17 | 11986836 |
| 18 | 16903236 |
| 19 | 23395365 |
| 20 | 31843525 |
| 21 | 42693035 |
| 22 | 56461251 |
| 23 | 73744946 |
| 24 | 95228050 |
| 25 | 121689750 |
| 26 | 154012950 |
| 27 | 193193091 |