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 | -3 |
| 2 | 6 |
| 3 | -10 |
| 4 | 16 |
| 5 | -27 |
| 6 | 49 |
| 7 | -92 |
| 8 | 172 |
| 9 | -316 |
| 10 | 573 |
| 11 | -1035 |
| 12 | 1874 |
| 13 | -3406 |
| 14 | 6204 |
| 15 | -11303 |
| 16 | 20577 |
| 17 | -37432 |
| 18 | 68072 |
| 19 | -123800 |
| 20 | 225193 |
| 21 | -409683 |
| 22 | 745342 |
| 23 | -1355970 |
| 24 | 2466760 |
| 25 | -4487395 |
| 26 | 8163217 |
| 27 | -14850196 |
| 28 | 27015092 |
| 29 | -49145300 |
| 30 | 89404037 |
| 31 | -162641499 |
| 32 | 295872778 |
| 33 | -538243174 |
| 34 | 979156724 |
| 35 | -1781254927 |
| 36 | 3240410561 |