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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 1 |
| 15 | 1 |
| 16 | 5 |
| 17 | 25 |
| 18 | 297 |
| 19 | 8199 |
| 20 | 377004 |
| 21 | 22014143 |
| 22 | 1493574756 |
| 23 | 114880777582 |
| 24 | 9919463450855 |
| 25 | 955388277929620 |
| 26 | 102101882472479938 |
| 27 | 12050526046888229845 |
| 28 | 1563967741064673811531 |
| 29 | 222318116370232302781485 |
| 30 | 34486536277291555593662301 |
| 31 | 5817920265098158804699762770 |