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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 11 |
| 6 | 36 |
| 7 | 372 |
| 8 | 2311 |
| 9 | 26252 |
| 10 | 243893 |
| 11 | 3173281 |
| 12 | 38916879 |
| 13 | 583922418 |
| 14 | 8808814262 |
| 15 | 151530476047 |
| 16 | 2694658394356 |
| 17 | 52607648010035 |
| 18 | 1072975736368359 |
| 19 | 23516009286474813 |
| 20 | 539838208864165036 |