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 | 2 |
| 2 | -23 |
| 3 | -216 |
| 4 | -943 |
| 5 | -2882 |
| 6 | -7047 |
| 7 | -14620 |
| 8 | -26207 |
| 9 | -39366 |
| 10 | -40951 |
| 11 | 16096 |
| 12 | 282609 |
| 13 | 1223030 |
| 14 | 4245145 |
| 15 | 13589532 |
| 16 | 41998145 |
| 17 | 127720306 |
| 18 | 385530921 |
| 19 | 1159785368 |
| 20 | 3483584401 |