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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 28 |
| 5 | 91 |
| 6 | 820 |
| 7 | 7381 |
| 8 | 65341 |
| 9 | 66430 |
| 10 | 597871 |
| 11 | 1633528 |
| 12 | 5380840 |
| 13 | 48339028 |
| 14 | 48427561 |
| 15 | 139386556 |
| 16 | 435848050 |
| 17 | 1178284240 |
| 18 | 3529890253 |
| 19 | 3922632451 |
| 20 | 32614707700 |
| 21 | 35296517971 |
| 22 | 35303692060 |
| 23 | 101891588176 |
| 24 | 292358957446 |
| 25 | 295883935480 |
| 26 | 317733228541 |
| 27 | 859413596320 |
| 28 | 2649105942220 |