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 | 4 |
| 3 | 5 |
| 4 | 4 |
| 5 | 7 |
| 6 | -10 |
| 7 | 9 |
| 8 | -44 |
| 9 | -23 |
| 10 | -197 |
| 11 | 13 |
| 12 | -845 |
| 13 | 15 |
| 14 | -2340 |
| 15 | -701 |
| 16 | -9164 |
| 17 | 19 |
| 18 | -31578 |
| 19 | 21 |
| 20 | -124979 |
| 21 | -11355 |
| 22 | -381326 |
| 23 | 25 |
| 24 | -1778580 |
| 25 | -3323 |
| 26 | -5162265 |
| 27 | -212899 |
| 28 | -21915630 |
| 29 | 31 |
| 30 | -70256029 |
| 31 | 33 |
| 32 | -311369996 |
| 33 | -4439583 |
| 34 | -1010580635 |
| 35 | -129393 |
| 36 | -4135827284 |
| 37 | 39 |
| 38 | -14467258386 |