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 | -2 |
| 3 | -3 |
| 4 | -4 |
| 5 | -9 |
| 6 | -11 |
| 7 | -17 |
| 8 | -82 |
| 9 | -86 |
| 10 | -89 |
| 11 | -259 |
| 12 | -1031 |
| 13 | -1493 |
| 14 | -3088 |
| 15 | -18107 |
| 16 | -3128320 |
| 17 | -4245574 |
| 18 | -4430458 |
| 19 | -6692218 |
| 20 | -6908807 |
| 21 | -20282631 |
| 22 | -55597679 |
| 23 | -73203786 |
| 24 | -80410013 |
| 25 | -92821351 |
| 26 | -192936649 |
| 27 | -5039379072 |
| 28 | -30234138756 |
| 29 | -55272287466 |
| 30 | -202248991637 |