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 | 4 |
| 3 | -7 |
| 4 | 11 |
| 5 | -18 |
| 6 | 29 |
| 7 | -47 |
| 8 | 76 |
| 9 | -123 |
| 10 | 199 |
| 11 | -322 |
| 12 | 521 |
| 13 | -843 |
| 14 | 1364 |
| 15 | -2207 |
| 16 | 3571 |
| 17 | -5778 |
| 18 | 9349 |
| 19 | -15127 |
| 20 | 24476 |
| 21 | -39603 |
| 22 | 64079 |
| 23 | -103682 |
| 24 | 167761 |
| 25 | -271443 |
| 26 | 439204 |
| 27 | -710647 |
| 28 | 1149851 |
| 29 | -1860498 |
| 30 | 3010349 |
| 31 | -4870847 |
| 32 | 7881196 |
| 33 | -12752043 |
| 34 | 20633239 |
| 35 | -33385282 |
| 36 | 54018521 |
| 37 | -87403803 |
| 38 | 141422324 |