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 | 8 |
| 2 | -56 |
| 3 | 156 |
| 4 | 13328 |
| 5 | -920 |
| 6 | -83678 |
| 7 | 1261988 |
| 8 | 54252742 |
| 9 | 214409844 |
| 10 | -3528354250 |
| 11 | 247094703588 |
| 12 | -509185323508 |
| 13 | 15154985424718 |
| 14 | 884710401396570 |
| 15 | 49777180907707320 |
| 16 | -172913218088289027 |
| 17 | 844641410704177098 |
| 18 | 3066058962037715903 |
| 19 | -33948947842497666568 |