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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | -2 |
| 6 | 5 |
| 7 | -6 |
| 8 | 5 |
| 9 | 3 |
| 10 | -26 |
| 11 | 70 |
| 12 | -141 |
| 13 | 221 |
| 14 | -229 |
| 15 | -18 |
| 16 | 891 |
| 17 | -2914 |
| 18 | 6524 |
| 19 | -11238 |
| 20 | 13690 |
| 21 | -4214 |
| 22 | -37619 |
| 23 | 145018 |
| 24 | -353534 |
| 25 | 657080 |
| 26 | -895234 |
| 27 | 534007 |
| 28 | 1654246 |
| 29 | -7840402 |
| 30 | 20737566 |
| 31 | -41200153 |
| 32 | 61402057 |
| 33 | -50500722 |
| 34 | -68352913 |
| 35 | 441195837 |
| 36 | -1272153666 |
| 37 | 2690651374 |