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 | -3 |
| 2 | -25 |
| 3 | -112 |
| 4 | -416 |
| 5 | -1411 |
| 6 | -4537 |
| 7 | -14085 |
| 8 | -42653 |
| 9 | -126794 |
| 10 | -371554 |
| 11 | -1076423 |
| 12 | -3089555 |
| 13 | -8799207 |
| 14 | -24897121 |
| 15 | -70052356 |
| 16 | -196151492 |
| 17 | -546916555 |
| 18 | -1519249933 |
| 19 | -4206274089 |
| 20 | -11611243109 |
| 21 | -31967026718 |
| 22 | -87796880710 |