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 | 24 |
| 2 | 276 |
| 3 | 2024 |
| 4 | 10650 |
| 5 | 43056 |
| 6 | 140668 |
| 7 | 388608 |
| 8 | 948267 |
| 9 | 2121176 |
| 10 | 4448292 |
| 11 | 8811024 |
| 12 | 16535160 |
| 13 | 29632464 |
| 14 | 51256788 |
| 15 | 86069680 |
| 16 | 140300001 |
| 17 | 222302544 |
| 18 | 344353516 |
| 19 | 523941288 |
| 20 | 782700672 |
| 21 | 1146771168 |
| 22 | 1653111384 |
| 23 | 2354351232 |
| 24 | 3312339849 |
| 25 | 4594531176 |
| 26 | 6293753580 |
| 27 | 8546252072 |