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 | 2 |
| 4 | 6 |
| 5 | 6 |
| 6 | 14 |
| 7 | -6 |
| 8 | 102 |
| 9 | -514 |
| 10 | 3726 |
| 11 | -29646 |
| 12 | 267014 |
| 13 | -2669898 |
| 14 | 29369166 |
| 15 | -352429654 |
| 16 | 4581585894 |
| 17 | -64142202066 |
| 18 | 962133031502 |
| 19 | -15394128503454 |
| 20 | 261700184559366 |
| 21 | -4710603322067866 |
| 22 | 89501463119290254 |
| 23 | -1790029262385804198 |
| 24 | 37590614510101889126 |