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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 9 |
| 7 | 26 |
| 8 | 299 |
| 9 | 1183 |
| 10 | 10701 |
| 11 | 24736 |
| 12 | 349241 |
| 13 | 626053 |
| 14 | 6680979 |
| 15 | 26364610 |
| 16 | 137247254 |
| 17 | 353304459 |
| 18 | 4826418027 |
| 19 | 8199440662 |
| 20 | 93679529503 |
| 21 | 315943737331 |
| 22 | 1913783074461 |
| 23 | 4382586624256 |
| 24 | 60629067776483 |