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 | 284 |
| 3 | 3987 |
| 4 | 182832 |
| 5 | 21719504 |
| 6 | 6188114528 |
| 7 | 3837284133564 |
| 8 | 5498735029150412 |
| 9 | 16177644099354374847 |
| 10 | 104146398517005199125840 |
| 11 | 1392276105682819242572329909 |
| 12 | 37088099509347734659184844866868 |
| 13 | 2148432835664289026090145748437694346 |