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 | -8 |
| 3 | -26 |
| 4 | 28 |
| 5 | 316 |
| 6 | 352 |
| 7 | -2456 |
| 8 | -8432 |
| 9 | 7696 |
| 10 | 99712 |
| 11 | 122464 |
| 12 | -752192 |
| 13 | -2729024 |
| 14 | 2063872 |
| 15 | 31417984 |
| 16 | 42197248 |
| 17 | -229785344 |
| 18 | -881543168 |
| 19 | 534767104 |
| 20 | 9884965888 |
| 21 | 14422260736 |
| 22 | -70005137408 |
| 23 | -284232882176 |
| 24 | 131585609728 |
| 25 | 3105500041216 |