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 | -2 |
| 3 | 5 |
| 4 | -11 |
| 5 | 6 |
| 6 | 146 |
| 7 | -1295 |
| 8 | 7712 |
| 9 | -36937 |
| 10 | 141514 |
| 11 | -357676 |
| 12 | -322973 |
| 13 | 12078666 |
| 14 | -102218510 |
| 15 | 623243991 |
| 16 | -3041134727 |
| 17 | 11440387382 |
| 18 | -23657862864 |
| 19 | -95377084665 |
| 20 | 1570488584608 |
| 21 | -12255377466362 |
| 22 | 72288056416374 |
| 23 | -340793435817068 |
| 24 | 1186234942871544 |
| 25 | -1525020468715715 |