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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | -4 |
| 6 | 19 |
| 7 | -27 |
| 8 | 61 |
| 9 | -89 |
| 10 | 156 |
| 11 | -230 |
| 12 | 383 |
| 13 | -597 |
| 14 | 981 |
| 15 | -1549 |
| 16 | 2493 |
| 17 | -3943 |
| 18 | 6301 |
| 19 | -10012 |
| 20 | 16020 |
| 21 | -25626 |
| 22 | 41174 |
| 23 | -66193 |
| 24 | 106639 |
| 25 | -171829 |
| 26 | 277083 |
| 27 | -446858 |
| 28 | 721033 |
| 29 | -1163798 |
| 30 | 1879329 |
| 31 | -3035767 |
| 32 | 4905405 |
| 33 | -7928249 |
| 34 | 12816369 |
| 35 | -20721187 |
| 36 | 33505745 |