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 | 1 |
| 2 | 2 |
| 3 | 0 |
| 4 | -4 |
| 5 | -6 |
| 6 | 0 |
| 7 | 21 |
| 8 | 64 |
| 9 | 135 |
| 10 | 238 |
| 11 | 374 |
| 12 | 540 |
| 13 | 728 |
| 14 | 924 |
| 15 | 1107 |
| 16 | 1248 |
| 17 | 1309 |
| 18 | 1242 |
| 19 | 988 |
| 20 | 476 |
| 21 | -378 |
| 22 | -1672 |
| 23 | -3519 |
| 24 | -6048 |
| 25 | -9405 |
| 26 | -13754 |
| 27 | -19278 |
| 28 | -26180 |
| 29 | -34684 |
| 30 | -45036 |
| 31 | -57505 |
| 32 | -72384 |
| 33 | -89991 |
| 34 | -110670 |
| 35 | -134792 |
| 36 | -162756 |
| 37 | -194990 |
| 38 | -231952 |
| 39 | -274131 |
| 40 | -322048 |
| 41 | -376257 |