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 | 7 |
| 2 | 54 |
| 3 | 534 |
| 4 | 4909 |
| 5 | 45405 |
| 6 | 385008 |
| 7 | 3539880 |
| 8 | 32260781 |
| 9 | 294001190 |
| 10 | 2564080248 |
| 11 | 23271246324 |
| 12 | 211753431947 |