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 | 3 |
| 2 | -4 |
| 3 | -8 |
| 4 | -26 |
| 5 | -52 |
| 6 | -126 |
| 7 | -320 |
| 8 | -1214 |
| 9 | -2016 |
| 10 | -7068 |
| 11 | -16064 |
| 12 | -48142 |
| 13 | -122552 |
| 14 | -390574 |
| 15 | -903176 |
| 16 | -3549556 |
| 17 | -7597004 |
| 18 | -22902332 |
| 19 | -61172890 |
| 20 | -198872948 |
| 21 | -486889660 |
| 22 | -1555059566 |
| 23 | -4093173788 |
| 24 | -12448334478 |
| 25 | -33815484714 |
| 26 | -105268420776 |
| 27 | -279683446078 |
| 28 | -894795490384 |
| 29 | -2366564864546 |