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 | -2 |
| 4 | -2 |
| 5 | -5 |
| 6 | -4 |
| 7 | -13 |
| 8 | -16 |
| 9 | -30 |
| 10 | -45 |
| 11 | -89 |
| 12 | -122 |
| 13 | -233 |
| 14 | -351 |
| 15 | -590 |
| 16 | -944 |
| 17 | -1597 |
| 18 | -2496 |
| 19 | -4181 |
| 20 | -6640 |
| 21 | -10894 |
| 22 | -17533 |
| 23 | -28657 |
| 24 | -46000 |
| 25 | -75000 |
| 26 | -120927 |
| 27 | -196290 |
| 28 | -317018 |
| 29 | -514229 |
| 30 | -830580 |
| 31 | -1346269 |
| 32 | -2176288 |
| 33 | -3524222 |
| 34 | -5699693 |
| 35 | -9227335 |
| 36 | -14924550 |
| 37 | -24157817 |
| 38 | -39079807 |
| 39 | -63245054 |
| 40 | -102320320 |
| 41 | -165580141 |
| 42 | -267890844 |