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 | -4 |
| 2 | 2 |
| 3 | -40 |
| 4 | -182 |
| 5 | -7624 |
| 6 | -202652 |
| 7 | -14115088 |
| 8 | -30800534 |
| 9 | -16435427656 |
| 10 | -1051314228316 |
| 11 | -22675483971248 |
| 12 | -6980651581556876 |
| 13 | -283099764343781072 |
| 14 | -163910651754113166328 |
| 15 | -43009695328217994139936 |
| 16 | -793529010007812171331166 |
| 17 | -20144221762701827321778088 |
| 18 | -274475989492312981198559876 |