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 | 45 |
| 5 | 216 |
| 6 | 1197 |
| 7 | 7134 |
| 8 | 46209 |
| 9 | 319555 |
| 10 | 2350183 |
| 11 | 18254380 |
| 12 | 149117618 |
| 13 | 1275857233 |
| 14 | 11396595255 |