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 | -2 |
| 3 | -5 |
| 4 | 1 |
| 5 | 16 |
| 6 | 13 |
| 7 | -35 |
| 8 | -74 |
| 9 | 31 |
| 10 | 253 |
| 11 | 160 |
| 12 | -599 |
| 13 | -1079 |
| 14 | 718 |
| 15 | 3955 |
| 16 | 1801 |
| 17 | -10064 |
| 18 | -15467 |
| 19 | 14725 |
| 20 | 61126 |
| 21 | 16951 |
| 22 | -166427 |
| 23 | -217280 |
| 24 | 282001 |
| 25 | 933841 |
| 26 | 87838 |
| 27 | -2713685 |
| 28 | -2977199 |
| 29 | 5163856 |
| 30 | 14095453 |
| 31 | -1396115 |
| 32 | -43682474 |
| 33 | -39494129 |
| 34 | 91553293 |
| 35 | 210035680 |
| 36 | -64624199 |
| 37 | -694731239 |
| 38 | -500858642 |