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 | 1 |
| 1 | 7 |
| 2 | 56 |
| 3 | 441 |
| 4 | 3479 |
| 5 | 27440 |
| 6 | 216433 |
| 7 | 1707111 |
| 8 | 13464808 |
| 9 | 106203433 |
| 10 | 837677687 |
| 11 | 6607167840 |
| 12 | 52113918689 |
| 13 | 411047605703 |
| 14 | 3242130670744 |
| 15 | 25572247935129 |
| 16 | 201700650241111 |
| 17 | 1590910287233680 |
| 18 | 12548276562323537 |
| 19 | 98974307946900519 |
| 20 | 780658091564568392 |