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 | 2 |
| 2 | 5 |
| 3 | 15 |
| 4 | 62 |
| 5 | 329 |
| 6 | 2307 |
| 7 | 21482 |
| 8 | 264021 |
| 9 | 4334045 |
| 10 | 94435970 |
| 11 | 2750500857 |
| 12 | 106769182533 |