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 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | -1 |
| 6 | -8 |
| 7 | -25 |
| 8 | -57 |
| 9 | -114 |
| 10 | -202 |
| 11 | -322 |
| 12 | -447 |
| 13 | -496 |
| 14 | -271 |
| 15 | 625 |
| 16 | 2914 |
| 17 | 7762 |
| 18 | 16834 |
| 19 | 32063 |
| 20 | 54760 |
| 21 | 83319 |
| 22 | 108375 |
| 23 | 103726 |
| 24 | 11110 |
| 25 | -282498 |
| 26 | -973439 |
| 27 | -2366432 |
| 28 | -4869919 |
| 29 | -8903455 |
| 30 | -14604094 |
| 31 | -21135454 |
| 32 | -25294718 |
| 33 | -19009153 |
| 34 | 14697432 |
| 35 | 107405319 |
| 36 | 311830247 |
| 37 | 705982670 |
| 38 | 1386882198 |
| 39 | 2436851006 |
| 40 | 3830805953 |