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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 261 |
| 3 | 1956 |
| 4 | 7291 |
| 5 | 19500 |
| 6 | 42846 |
| 7 | 82621 |
| 8 | 145146 |
| 9 | 237771 |
| 10 | 368875 |
| 11 | 547866 |
| 12 | 785181 |
| 13 | 1092286 |
| 14 | 1481676 |
| 15 | 1966875 |
| 16 | 2562436 |
| 17 | 3283941 |
| 18 | 4148001 |
| 19 | 5172256 |
| 20 | 6375375 |
| 21 | 7777056 |
| 22 | 9398026 |
| 23 | 11260041 |
| 24 | 13385886 |
| 25 | 15799375 |
| 26 | 18525351 |
| 27 | 21589686 |
| 28 | 25019281 |
| 29 | 28842066 |
| 30 | 33087000 |