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 | -6 |
| 3 | 6 |
| 4 | 14 |
| 5 | 30 |
| 6 | -14 |
| 7 | -98 |
| 8 | -86 |
| 9 | -150 |
| 10 | 282 |
| 11 | 486 |
| 12 | 502 |
| 13 | 670 |
| 14 | -1118 |
| 15 | -1226 |
| 16 | -4396 |
| 17 | -3814 |
| 18 | 1326 |
| 19 | 3834 |
| 20 | 20354 |
| 21 | 16330 |
| 22 | 18334 |
| 23 | -6606 |
| 24 | -45658 |
| 25 | -60762 |
| 26 | -121770 |
| 27 | -60122 |
| 28 | -22750 |
| 29 | 160314 |
| 30 | 303638 |
| 31 | 435450 |
| 32 | 542336 |
| 33 | 162782 |
| 34 | -45830 |
| 35 | -1090994 |
| 36 | -1576378 |
| 37 | -2608146 |
| 38 | -2408142 |
| 39 | -988202 |
| 40 | 479834 |