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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -3 |
| 8 | -9 |
| 9 | -19 |
| 10 | -34 |
| 11 | -55 |
| 12 | -82 |
| 13 | -112 |
| 14 | -136 |
| 15 | -135 |
| 16 | -75 |
| 17 | 99 |
| 18 | 469 |
| 19 | 1147 |
| 20 | 2269 |
| 21 | 3970 |
| 22 | 6325 |
| 23 | 9235 |
| 24 | 12231 |
| 25 | 14166 |
| 26 | 12771 |
| 27 | 4076 |
| 28 | -18244 |
| 29 | -63424 |
| 30 | -143695 |
| 31 | -273223 |
| 32 | -464779 |
| 33 | -722439 |
| 34 | -1027959 |
| 35 | -1317915 |
| 36 | -1448612 |
| 37 | -1146827 |
| 38 | 52219 |
| 39 | 2870965 |
| 40 | 8337370 |
| 41 | 17769349 |
| 42 | 32615514 |
| 43 | 54022692 |
| 44 | 81938664 |