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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 1 |
| 4 | -4 |
| 5 | 0 |
| 6 | -9 |
| 7 | -5 |
| 8 | -23 |
| 9 | -24 |
| 10 | -65 |
| 11 | -90 |
| 12 | -196 |
| 13 | -311 |
| 14 | -613 |
| 15 | -1039 |
| 16 | -1954 |
| 17 | -3419 |
| 18 | -6288 |
| 19 | -11172 |
| 20 | -20329 |
| 21 | -36385 |
| 22 | -65871 |
| 23 | -118312 |
| 24 | -213669 |
| 25 | -384422 |
| 26 | -693448 |
| 27 | -1248623 |
| 28 | -2251097 |
| 29 | -4054895 |
| 30 | -7308466 |
| 31 | -13167159 |
| 32 | -23729196 |
| 33 | -42755048 |
| 34 | -77046281 |
| 35 | -138827181 |
| 36 | -250164695 |
| 37 | -450772776 |