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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 16 |
| 6 | 40 |
| 7 | 93 |
| 8 | 226 |
| 9 | 540 |
| 10 | 1336 |
| 11 | 3284 |
| 12 | 8068 |
| 13 | 19664 |
| 14 | 47880 |
| 15 | 116407 |
| 16 | 282866 |
| 17 | 687666 |
| 18 | 1673920 |
| 19 | 4077020 |
| 20 | 9929636 |