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 | 2 |
| 2 | 4 |
| 3 | 14 |
| 4 | 106 |
| 5 | 1732 |
| 6 | 66634 |
| 7 | 5745700 |
| 8 | 1058905642 |
| 9 | 461715853196 |
| 10 | 461918527950694 |
| 11 | 989913403174541980 |
| 12 | 5009399946447021173140 |
| 13 | 60070720443204091719085184 |
| 14 | 1548154498059133199618813305334 |
| 15 | 92346622775540905956057053976278584 |