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 | 4 |
| 3 | -15 |
| 4 | -2 |
| 5 | 79 |
| 6 | -88 |
| 7 | -294 |
| 8 | 815 |
| 9 | 488 |
| 10 | -4769 |
| 11 | 3438 |
| 12 | 20080 |
| 13 | -42527 |
| 14 | -49666 |
| 15 | 278943 |
| 16 | -93220 |
| 17 | -1308634 |
| 18 | 2103343 |
| 19 | 4067664 |
| 20 | -15799793 |
| 21 | -1126550 |
| 22 | 82089836 |
| 23 | -96324543 |
| 24 | -299451394 |
| 25 | 864290495 |
| 26 | 454552096 |
| 27 | -4979131422 |
| 28 | 3870112831 |
| 29 | 20615805880 |
| 30 | -45400053553 |
| 31 | -48829731594 |
| 32 | 292575692408 |