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 | -4 |
| 3 | -5 |
| 4 | -1 |
| 5 | 21 |
| 6 | 49 |
| 7 | 81 |
| 8 | 45 |
| 9 | -121 |
| 10 | -484 |
| 11 | -997 |
| 12 | -1344 |
| 13 | -840 |
| 14 | 1624 |
| 15 | 6931 |
| 16 | 15149 |
| 17 | 23155 |
| 18 | 23469 |
| 19 | 2240 |
| 20 | -57596 |
| 21 | -168929 |
| 22 | -322587 |
| 23 | -461165 |
| 24 | -450668 |
| 25 | -64135 |
| 26 | 985621 |
| 27 | 2935044 |
| 28 | 5718865 |
| 29 | 8597971 |
| 30 | 9683008 |
| 31 | 5596899 |
| 32 | -8414092 |
| 33 | -37295629 |
| 34 | -83336988 |
| 35 | -141108721 |