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 | 13377 |
| 3 | 1620843 |
| 4 | 914646205 |
| 5 | 272086395449 |
| 6 | 103598912114381 |
| 7 | 35743258143250665 |
| 8 | 12820466607209726137 |
| 9 | 4528155459015015278497 |
| 10 | 1609120545126107661426575 |
| 11 | 570433530146121798730683231 |
| 12 | 202412926394304755588236748481 |
| 13 | 71796961505258542492662333092533 |