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 | -2 |
| 3 | -7 |
| 4 | -10 |
| 5 | -5 |
| 6 | 11 |
| 7 | 35 |
| 8 | 56 |
| 9 | 54 |
| 10 | 0 |
| 11 | -143 |
| 12 | -418 |
| 13 | -871 |
| 14 | -1547 |
| 15 | -2485 |
| 16 | -3712 |
| 17 | -5236 |
| 18 | -7038 |
| 19 | -9063 |
| 20 | -11210 |
| 21 | -13321 |
| 22 | -15169 |
| 23 | -16445 |
| 24 | -16744 |
| 25 | -15550 |
| 26 | -12220 |
| 27 | -5967 |
| 28 | 4158 |
| 29 | 19285 |
| 30 | 40745 |
| 31 | 70091 |
| 32 | 109120 |
| 33 | 159896 |
| 34 | 224774 |
| 35 | 306425 |
| 36 | 407862 |
| 37 | 532467 |
| 38 | 684019 |
| 39 | 866723 |