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 | 0 |
| 3 | -2 |
| 4 | 0 |
| 5 | -3 |
| 6 | 0 |
| 7 | -4 |
| 8 | 2 |
| 9 | -5 |
| 10 | 8 |
| 11 | 0 |
| 12 | 26 |
| 13 | 19 |
| 14 | 74 |
| 15 | 74 |
| 16 | 195 |
| 17 | 221 |
| 18 | 464 |
| 19 | 560 |
| 20 | 1042 |
| 21 | 1258 |
| 22 | 2154 |
| 23 | 2536 |
| 24 | 3997 |
| 25 | 4341 |
| 26 | 6152 |
| 27 | 5204 |
| 28 | 5447 |
| 29 | -1617 |
| 30 | -10790 |
| 31 | -39710 |
| 32 | -83915 |
| 33 | -181639 |
| 34 | -336564 |
| 35 | -633844 |
| 36 | -1108334 |
| 37 | -1952371 |
| 38 | -3293590 |
| 39 | -5568202 |
| 40 | -9148916 |
| 41 | -15017471 |
| 42 | -24144556 |
| 43 | -38697396 |
| 44 | -61005748 |
| 45 | -95708150 |