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 | -2 |
| 3 | -2 |
| 4 | -1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 11 |
| 8 | 17 |
| 9 | 26 |
| 10 | 36 |
| 11 | 35 |
| 12 | 20 |
| 13 | -5 |
| 14 | -65 |
| 15 | -221 |
| 16 | -510 |
| 17 | -897 |
| 18 | -1379 |
| 19 | -2157 |
| 20 | -3498 |
| 21 | -5225 |
| 22 | -6500 |
| 23 | -6425 |
| 24 | -4775 |
| 25 | -1463 |
| 26 | 5951 |
| 27 | 25905 |
| 28 | 74833 |
| 29 | 173129 |
| 30 | 334719 |
| 31 | 563200 |
| 32 | 876876 |
| 33 | 1363232 |
| 34 | 2208921 |
| 35 | 3621969 |
| 36 | 5631470 |
| 37 | 7896109 |
| 38 | 9725768 |
| 39 | 10374574 |
| 40 | 9340382 |
| 41 | 6104500 |
| 42 | -1413334 |