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 | 0 |
| 1 | 1 |
| 2 | 21 |
| 3 | 71 |
| 4 | 196 |
| 5 | 2071 |
| 6 | 2071 |
| 7 | 33321 |
| 8 | 345821 |
| 9 | 736446 |
| 10 | 8548946 |
| 11 | 18314571 |
| 12 | 18314571 |
| 13 | 994877071 |
| 14 | 994877071 |
| 15 | 25408939571 |
| 16 | 86444095821 |
| 17 | 239031986446 |
| 18 | 1001971439571 |
| 19 | 16260760502071 |
| 20 | 92554705814571 |
| 21 | 283289569095821 |
| 22 | 1236963885502071 |
| 23 | 8389521258548946 |