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 | 12 |
| 3 | 184 |
| 4 | 9104 |
| 5 | 1225248 |
| 6 | 540023488 |
| 7 | 652225844096 |
| 8 | 2584219514040576 |
| 9 | 28081351726592246272 |
| 10 | 1001235747932175990213632 |
| 11 | 97915621602690773814148184064 |
| 12 | 31420034518763282871588038742544384 |
| 13 | 27654326463468067495668136467306727743488 |