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 | 1 |
| 2 | 24 |
| 3 | 93 |
| 4 | 275 |
| 5 | 2205 |
| 6 | 13248 |
| 7 | 67215 |
| 8 | 401415 |
| 9 | 2403621 |
| 10 | 13717554 |
| 11 | 79734011 |
| 12 | 467605069 |
| 13 | 2718919839 |
| 14 | 15817878296 |
| 15 | 92253538261 |
| 16 | 537481451021 |
| 17 | 3130277448285 |
| 18 | 18239061232932 |
| 19 | 106267286686423 |
| 20 | 619075960613237 |
| 21 | 3606738104606245 |