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 | 3 |
| 1 | 14 |
| 2 | 78 |
| 3 | 476 |
| 4 | 3042 |
| 5 | 19964 |
| 6 | 133338 |
| 7 | 901796 |
| 8 | 6155682 |
| 9 | 42307244 |
| 10 | 292241898 |
| 11 | 2026156916 |
| 12 | 14085431922 |
| 13 | 98109721724 |
| 14 | 684326604858 |
| 15 | 4778079120836 |
| 16 | 33385518525762 |
| 17 | 233393453571404 |
| 18 | 1632228295438218 |
| 19 | 11417968672225556 |
| 20 | 79887633730301202 |
| 21 | 559022701243584284 |