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 | 3 |
| 2 | 10 |
| 3 | 71 |
| 4 | 3054 |
| 5 | 5518579 |
| 6 | 18009568007498 |
| 7 | 191802924939285448393150887 |
| 8 | 21754999921504126977590785836876485101156736372842942 |