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 | 1 |
| 1 | -2 |
| 2 | -26 |
| 3 | 76 |
| 4 | 1222 |
| 5 | -3772 |
| 6 | -64676 |
| 7 | 203992 |
| 8 | 3607622 |
| 9 | -11510636 |
| 10 | -207302156 |
| 11 | 666187432 |
| 12 | 12142184476 |
| 13 | -39211413464 |
| 14 | -720760216328 |
| 15 | 2335857124016 |
| 16 | 43208062233158 |
| 17 | -140406756766796 |
| 18 | -2609918906614652 |
| 19 | 8498967890177416 |
| 20 | 158596941629422132 |
| 21 | -517334728427373704 |
| 22 | -9684521991498517112 |