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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -11 |
| 5 | 19 |
| 6 | -9 |
| 7 | 1 |
| 8 | -46 |
| 9 | 663 |
| 10 | -3748 |
| 11 | 7711 |
| 12 | -6606 |
| 13 | 2025 |
| 14 | 1 |
| 15 | -130 |
| 16 | 6501 |
| 17 | -163160 |
| 18 | 2236466 |
| 19 | -17123340 |
| 20 | 71497186 |
| 21 | -154127320 |
| 22 | 174334221 |
| 23 | -98986050 |
| 24 | 22325625 |
| 25 | 1 |
| 26 | -295 |
| 27 | 36729 |
| 28 | -2549775 |
| 29 | 109746165 |
| 30 | -3080128275 |
| 31 | 57713313405 |
| 32 | -727045264875 |