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 | 41 |
| 1 | 457 |
| 2 | 12113 |
| 3 | 41455 |
| 4 | 305867 |
| 5 | 3000929 |
| 6 | 5664121 |
| 7 | 29442493 |
| 8 | 75028961 |
| 9 | 115285297 |
| 10 | 255381053 |
| 11 | 738339317 |
| 12 | 1884309221 |
| 13 | 2516676241 |
| 14 | 5657847163 |
| 15 | 9307388231 |
| 16 | 11805057217 |
| 17 | 23150085349 |
| 18 | 35212054847 |
| 19 | 63554702993 |
| 20 | 131233995553 |