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 | 9 |
| 3 | 305 |
| 4 | 39705 |
| 5 | 20412737 |
| 6 | 41846783913 |
| 7 | 342892875489361 |
| 8 | 11236600170415809849 |
| 9 | 1472826135905484728387681 |
| 10 | 772188014962631262957890704329 |
| 11 | 1619397184353040716422147490531778929 |
| 12 | 13584491414647344530078887450781292845554521 |