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 | 1 |
| 3 | -6 |
| 4 | -20 |
| 5 | -26 |
| 6 | 19 |
| 7 | 162 |
| 8 | 339 |
| 9 | 180 |
| 10 | -1000 |
| 11 | -3380 |
| 12 | -4459 |
| 13 | 3042 |
| 14 | 27221 |
| 15 | 57614 |
| 16 | 31940 |
| 17 | -166446 |
| 18 | -571161 |
| 19 | -764478 |
| 20 | 485479 |
| 21 | 4573160 |
| 22 | 9790000 |
| 23 | 5654040 |
| 24 | -27693719 |
| 25 | -96502718 |
| 26 | -131022359 |
| 27 | 77196834 |
| 28 | 768159900 |
| 29 | 1663276734 |
| 30 | 998702459 |
| 31 | -4605941918 |
| 32 | -16302704581 |