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 | 4 |
| 2 | 10 |
| 3 | 19 |
| 4 | 28 |
| 5 | 28 |
| 6 | 1 |
| 7 | -80 |
| 8 | -242 |
| 9 | -485 |
| 10 | -728 |
| 11 | -728 |
| 12 | 1 |
| 13 | 2188 |
| 14 | 6562 |
| 15 | 13123 |
| 16 | 19684 |
| 17 | 19684 |
| 18 | 1 |
| 19 | -59048 |
| 20 | -177146 |
| 21 | -354293 |
| 22 | -531440 |
| 23 | -531440 |
| 24 | 1 |
| 25 | 1594324 |
| 26 | 4782970 |
| 27 | 9565939 |
| 28 | 14348908 |
| 29 | 14348908 |
| 30 | 1 |
| 31 | -43046720 |
| 32 | -129140162 |
| 33 | -258280325 |
| 34 | -387420488 |
| 35 | -387420488 |
| 36 | 1 |
| 37 | 1162261468 |