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 | 7 |
| 2 | 73 |
| 3 | 697 |
| 4 | 6433 |
| 5 | 58537 |
| 6 | 529393 |
| 7 | 4774777 |
| 8 | 43013953 |
| 9 | 387289417 |
| 10 | 3486260113 |
| 11 | 31378962457 |
| 12 | 282421147873 |
| 13 | 2541832273897 |
| 14 | 22876658237233 |
| 15 | 205890595223737 |
| 16 | 1853018041368193 |
| 17 | 16677173109731977 |
| 18 | 150094600937260753 |
| 19 | 1350851580234038617 |
| 20 | 12157664909301114913 |