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 | -1 |
| 3 | 2 |
| 4 | -4 |
| 5 | 7 |
| 6 | -14 |
| 7 | 32 |
| 8 | -64 |
| 9 | 120 |
| 10 | -244 |
| 11 | 502 |
| 12 | -1004 |
| 13 | 1996 |
| 14 | -3992 |
| 15 | 8048 |
| 16 | -16124 |
| 17 | 32104 |
| 18 | -64208 |
| 19 | 128712 |
| 20 | -257424 |
| 21 | 514416 |
| 22 | -1028960 |
| 23 | 2058924 |
| 24 | -4117848 |
| 25 | 8233832 |
| 26 | -16467713 |
| 27 | 32939418 |
| 28 | -65879316 |
| 29 | 131750904 |
| 30 | -263501808 |
| 31 | 527020884 |
| 32 | -1054041768 |
| 33 | 2108050776 |
| 34 | -4216103560 |
| 35 | 8432271328 |