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 | 5 |
| 2 | 29 |
| 3 | 193 |
| 4 | 1453 |
| 5 | 12209 |
| 6 | 113237 |
| 7 | 1149241 |
| 8 | 12675661 |
| 9 | 151095569 |
| 10 | 1937411429 |
| 11 | 26614052617 |
| 12 | 390244490749 |
| 13 | 6087782363009 |
| 14 | 100728768290645 |
| 15 | 1762767028074937 |
| 16 | 32542231109506285 |
| 17 | 632202858036492593 |
| 18 | 12895661952702667205 |