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 | 0 |
| 2 | 0 |
| 3 | -1 |
| 4 | 2 |
| 5 | 0 |
| 6 | 1 |
| 7 | -4 |
| 8 | 4 |
| 9 | -1 |
| 10 | 6 |
| 11 | -12 |
| 12 | 9 |
| 13 | -8 |
| 14 | 24 |
| 15 | -33 |
| 16 | 26 |
| 17 | -40 |
| 18 | 81 |
| 19 | -92 |
| 20 | 92 |
| 21 | -161 |
| 22 | 254 |
| 23 | -276 |
| 24 | 345 |
| 25 | -576 |
| 26 | 784 |
| 27 | -897 |
| 28 | 1266 |
| 29 | -1936 |
| 30 | 2465 |
| 31 | -3060 |
| 32 | 4468 |
| 33 | -6337 |
| 34 | 7990 |
| 35 | -10588 |
| 36 | 15273 |
| 37 | -20664 |
| 38 | 26568 |
| 39 | -36449 |
| 40 | 51210 |
| 41 | -67896 |
| 42 | 89585 |
| 43 | -124108 |
| 44 | 170316 |
| 45 | -225377 |
| 46 | 303278 |
| 47 | -418532 |
| 48 | 566009 |
| 49 | -754032 |
| 50 | 1025088 |