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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | -2 |
| 4 | -11 |
| 5 | 31 |
| 6 | 14 |
| 7 | -349 |
| 8 | 1047 |
| 9 | 820 |
| 10 | -21265 |
| 11 | 90355 |
| 12 | -26352 |
| 13 | -2086083 |
| 14 | 14092615 |
| 15 | -32449650 |
| 16 | -241320287 |
| 17 | 3080629195 |
| 18 | -15455723498 |
| 19 | -2456654665 |
| 20 | 760213889483 |
| 21 | -7097893818852 |
| 22 | 28459679925187 |
| 23 | 125560349169887 |
| 24 | -3153253543188992 |
| 25 | 26852335900600041 |
| 26 | -86130449768002245 |