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 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 8 |
| 4 | 9 |
| 5 | 4 |
| 6 | -15 |
| 7 | -64 |
| 8 | -175 |
| 9 | -412 |
| 10 | -903 |
| 11 | -1904 |
| 12 | -3927 |
| 13 | -7996 |
| 14 | -16159 |
| 15 | -32512 |
| 16 | -65247 |
| 17 | -130748 |
| 18 | -261783 |
| 19 | -523888 |
| 20 | -1048135 |
| 21 | -2096668 |
| 22 | -4193775 |
| 23 | -8388032 |
| 24 | -16776591 |
| 25 | -33553756 |
| 26 | -67108135 |
| 27 | -134216944 |
| 28 | -268434615 |
| 29 | -536870012 |
| 30 | -1073740863 |
| 31 | -2147482624 |
| 32 | -4294966207 |
| 33 | -8589933436 |
| 34 | -17179867959 |