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 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | -1 |
| 6 | -1 |
| 7 | -1 |
| 8 | -2 |
| 9 | -2 |
| 10 | -4 |
| 11 | -4 |
| 12 | -7 |
| 13 | -9 |
| 14 | -13 |
| 15 | -19 |
| 16 | -25 |
| 17 | -38 |
| 18 | -51 |
| 19 | -75 |
| 20 | -104 |
| 21 | -149 |
| 22 | -211 |
| 23 | -298 |
| 24 | -426 |
| 25 | -600 |
| 26 | -857 |
| 27 | -1211 |
| 28 | -1724 |
| 29 | -2444 |
| 30 | -3471 |
| 31 | -4930 |
| 32 | -6995 |
| 33 | -9940 |
| 34 | -14104 |
| 35 | -20038 |
| 36 | -28444 |
| 37 | -40397 |
| 38 | -57362 |
| 39 | -81453 |
| 40 | -115675 |
| 41 | -164250 |
| 42 | -233262 |
| 43 | -331227 |