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 | 3 |
| 2 | 7 |
| 3 | 29 |
| 4 | 146 |
| 5 | 877 |
| 6 | 7017 |
| 7 | 63154 |
| 8 | 631541 |
| 9 | 6946952 |
| 10 | 83363425 |
| 11 | 1083724526 |
| 12 | 15172143365 |