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 | 9 |
| 3 | 76 |
| 4 | 605 |
| 5 | 5351 |
| 6 | 49789 |
| 7 | 480401 |
| 8 | 4766086 |
| 9 | 48292018 |
| 10 | 497690157 |
| 11 | 5200558352 |
| 12 | 54971657745 |
| 13 | 586748531155 |
| 14 | 6315126497084 |
| 15 | 68461134239364 |
| 16 | 746869322310992 |
| 17 | 8193320926852194 |
| 18 | 90327637946283912 |
| 19 | 1000230167386765676 |
| 20 | 11120012336000921992 |
| 21 | 124071390413266176706 |
| 22 | 1388854343860145268801 |