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 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | -2 |
| 5 | 2 |
| 6 | 6 |
| 7 | -5 |
| 8 | -18 |
| 9 | 15 |
| 10 | 59 |
| 11 | -54 |
| 12 | -215 |
| 13 | 199 |
| 14 | 813 |
| 15 | -744 |
| 16 | -3135 |
| 17 | 2890 |
| 18 | 12394 |
| 19 | -11538 |
| 20 | -50017 |
| 21 | 46806 |
| 22 | 204893 |
| 23 | -192451 |
| 24 | -849681 |
| 25 | 800974 |
| 26 | 3560927 |
| 27 | -3367656 |
| 28 | -15058478 |
| 29 | 14279426 |
| 30 | 64171736 |
| 31 | -60992032 |
| 32 | -275304665 |
| 33 | 262199050 |
| 34 | 1188070488 |
| 35 | -1133572891 |
| 36 | -5153913606 |