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 | 0 |
| 3 | -2 |
| 4 | -2 |
| 5 | 6 |
| 6 | 19 |
| 7 | 1 |
| 8 | -98 |
| 9 | -170 |
| 10 | 268 |
| 11 | 1464 |
| 12 | 967 |
| 13 | -7253 |
| 14 | -19035 |
| 15 | 11497 |
| 16 | 142894 |
| 17 | 186814 |
| 18 | -592148 |
| 19 | -2327480 |
| 20 | -371472 |
| 21 | 14922592 |
| 22 | 30367918 |
| 23 | -44517534 |
| 24 | -291059645 |
| 25 | -242260229 |
| 26 | 1550840094 |
| 27 | 4611423196 |
| 28 | -2050694753 |
| 29 | -36095033685 |
| 30 | -54276040088 |
| 31 | 150373292998 |