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 | 4 |
| 3 | 11 |
| 4 | 41 |
| 5 | 222 |
| 6 | 1761 |
| 7 | 21064 |
| 8 | 386241 |
| 9 | 11044282 |
| 10 | 500411824 |
| 11 | 36427700084 |
| 12 | 4313893200131 |
| 13 | 840463941752366 |
| 14 | 272080763704257502 |
| 15 | 147646989859379243894 |
| 16 | 135364497363933610026002 |