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 | -2 |
| 2 | -2 |
| 3 | -2 |
| 4 | 0 |
| 5 | 6 |
| 6 | 18 |
| 7 | 38 |
| 8 | 68 |
| 9 | 108 |
| 10 | 148 |
| 11 | 148 |
| 12 | -2 |
| 13 | -552 |
| 14 | -2004 |
| 15 | -5280 |
| 16 | -11960 |
| 17 | -24590 |
| 18 | -46990 |
| 19 | -84254 |
| 20 | -141476 |
| 21 | -218654 |
| 22 | -295794 |
| 23 | -295374 |
| 24 | 3540 |
| 25 | 1148110 |
| 26 | 4378918 |
| 27 | 12332318 |
| 28 | 30327568 |
| 29 | 68633710 |
| 30 | 146303026 |
| 31 | 297349758 |
| 32 | 580052778 |
| 33 | 1089382158 |
| 34 | 1969425038 |
| 35 | 3413378318 |
| 36 | 5614375970 |