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 | 3 |
| 3 | -2 |
| 4 | -39 |
| 5 | -176 |
| 6 | -442 |
| 7 | -26 |
| 8 | 6222 |
| 9 | 36062 |
| 10 | 113240 |
| 11 | 91632 |
| 12 | -1303985 |
| 13 | -9362520 |
| 14 | -34625652 |
| 15 | -50327818 |
| 16 | 293446186 |
| 17 | 2693939308 |
| 18 | 11475384425 |
| 19 | 23120716658 |
| 20 | -62820989127 |
| 21 | -813918935104 |
| 22 | -3964894957296 |
| 23 | -10002153961552 |
| 24 | 10192131001136 |
| 25 | 250612187843962 |