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 | 3 |
| 3 | -1 |
| 4 | -2 |
| 5 | 6 |
| 6 | 0 |
| 7 | -16 |
| 8 | 23 |
| 9 | 40 |
| 10 | -140 |
| 11 | 13 |
| 12 | 591 |
| 13 | -827 |
| 14 | -1577 |
| 15 | 5887 |
| 16 | -500 |
| 17 | -27095 |
| 18 | 38922 |
| 19 | 77859 |
| 20 | -295183 |
| 21 | 21310 |
| 22 | 1428714 |
| 23 | -2069421 |
| 24 | -4295099 |
| 25 | 16345171 |
| 26 | -921876 |
| 27 | -81760620 |
| 28 | 118435457 |
| 29 | 253839799 |
| 30 | -963510264 |
| 31 | 37372170 |
| 32 | 4936868645 |
| 33 | -7119213992 |
| 34 | -15717478733 |
| 35 | 59293735690 |