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 | 3 |
| 3 | 10 |
| 4 | 55 |
| 5 | 254 |
| 6 | 1643 |
| 7 | 10164 |
| 8 | 63488 |
| 9 | 364843 |
| 10 | 1930906 |
| 11 | 9262768 |
| 12 | 40411006 |
| 13 | 160421289 |
| 14 | 581839267 |
| 15 | 1934022164 |