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 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 22 |
| 6 | 53 |
| 7 | 184 |
| 8 | 353 |
| 9 | 1376 |
| 10 | 3977 |
| 11 | 363904 |
| 12 | 396498 |
| 13 | 39920896 |
| 14 | 40060127 |
| 15 | 1543910 |
| 16 | 4687418 |
| 17 | 1307674433536 |
| 18 | 1307902407753 |
| 19 | 355687428358144 |
| 20 | 355691118382364 |
| 21 | 162615882312376736 |
| 22 | 1267150213999727 |
| 23 | 51090942171713634304 |
| 24 | 51090956256672365547 |