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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 4 |
| 7 | 2 |
| 8 | -3 |
| 9 | -12 |
| 10 | -25 |
| 11 | -40 |
| 12 | -52 |
| 13 | -52 |
| 14 | -27 |
| 15 | 38 |
| 16 | 155 |
| 17 | 324 |
| 18 | 520 |
| 19 | 678 |
| 20 | 681 |
| 21 | 360 |
| 22 | -481 |
| 23 | -2000 |
| 24 | -4200 |
| 25 | -6760 |
| 26 | -8839 |
| 27 | -8918 |
| 28 | -4797 |
| 29 | 6084 |
| 30 | 25804 |
| 31 | 54442 |
| 32 | 87877 |
| 33 | 115228 |
| 34 | 116775 |
| 35 | 63880 |
| 36 | -76892 |
| 37 | -332892 |
| 38 | -705667 |
| 39 | -1142322 |