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 | 5 |
| 2 | 12 |
| 3 | 13 |
| 4 | 52 |
| 5 | 2431 |
| 6 | 16 |
| 7 | 153888 |
| 8 | 27417323062119920 |
| 9 | 223378173194137397198 |
| 10 | 452 |
| 11 | 406 |
| 12 | 150886 |
| 13 | 23 |
| 14 | 40 |
| 15 | 2153717 |
| 16 | 28 |
| 17 | 92971458509 |
| 18 | 130 |
| 19 | 40998 |