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) |
|---|---|
| 3 | 1 |
| 4 | 12 |
| 5 | 174 |
| 6 | 2436 |
| 7 | 34307 |
| 8 | 482664 |
| 9 | 6791772 |
| 10 | 95567064 |
| 11 | 1344731653 |
| 12 | 18921807828 |
| 13 | 266250046986 |
| 14 | 3746422451772 |
| 15 | 52716164405255 |
| 16 | 741772724044560 |
| 17 | 10437534301224120 |
| 18 | 146867252940711408 |
| 19 | 2066579075472320521 |
| 20 | 29078974309550454492 |
| 21 | 409172219409185308518 |
| 22 | 5757490046038128779316 |