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 | 3 |
| 3 | 8 |
| 4 | 25 |
| 5 | 57 |
| 6 | 22 |
| 7 | -1003 |
| 8 | -9967 |
| 9 | -67627 |
| 10 | -394013 |
| 11 | -1958808 |
| 12 | -7869346 |
| 13 | -17261270 |
| 14 | 104411359 |
| 15 | 1931214493 |
| 16 | 19188604691 |
| 17 | 153913872501 |
| 18 | 1080677292567 |
| 19 | 6709916699425 |
| 20 | 35489004465351 |
| 21 | 135918792966633 |
| 22 | -9832967202556 |
| 23 | -7535958768199373 |
| 24 | -106301159541342282 |