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 | 2 |
| 4 | 4 |
| 5 | 13 |
| 6 | 33 |
| 7 | 72 |
| 8 | 204 |
| 9 | 476 |
| 10 | 1348 |
| 11 | 3454 |
| 12 | 9511 |
| 13 | 25088 |
| 14 | 68579 |
| 15 | 186048 |
| 16 | 503538 |
| 17 | 1387536 |
| 18 | 3732666 |
| 19 | 10420102 |