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 | 0 |
| 3 | 2 |
| 4 | 6 |
| 5 | 14 |
| 6 | 22 |
| 7 | 252 |
| 8 | 5 |
| 9 | 92 |
| 10 | 17526 |
| 11 | 324 |
| 12 | 2916 |
| 13 | 422 |
| 14 | 9278038 |
| 15 | 411126 |
| 16 | 23694308 |
| 17 | 2074 |
| 18 | 8716 |
| 19 | 1186593143406 |
| 20 | 47570 |
| 21 | 11395487424 |
| 22 | 918166 |
| 23 | 10754 |
| 24 | 789632365568454684 |
| 25 | 343234 |
| 26 | 1164751580868 |
| 27 | 42 |
| 28 | 917581820575340 |
| 29 | 1914786011328142 |
| 30 | 58202 |
| 31 | 17423496 |