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 | -1 |
| 2 | -11 |
| 3 | -50 |
| 4 | -186 |
| 5 | -631 |
| 6 | -2029 |
| 7 | -6299 |
| 8 | -19075 |
| 9 | -56704 |
| 10 | -166164 |
| 11 | -481391 |
| 12 | -1381691 |
| 13 | -3935125 |
| 14 | -11134331 |
| 15 | -31328366 |
| 16 | -87721614 |
| 17 | -244588519 |
| 18 | -679429225 |
| 19 | -1881102959 |
| 20 | -5192705779 |
| 21 | -14296088956 |
| 22 | -39263958696 |
| 23 | -107601905375 |
| 24 | -294291714551 |
| 25 | -803416991401 |