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 | 2 |
| 2 | -22 |
| 3 | -117 |
| 4 | -468 |
| 5 | -1755 |
| 6 | -6513 |
| 7 | -24336 |
| 8 | -91988 |
| 9 | -351689 |
| 10 | -1357408 |
| 11 | -5277363 |
| 12 | -20625774 |
| 13 | -80909257 |
| 14 | -318173258 |
| 15 | -1253243498 |
| 16 | -4941450657 |
| 17 | -19495914360 |
| 18 | -76945654032 |
| 19 | -303737001009 |
| 20 | -1199041027587 |
| 21 | -4733273752831 |
| 22 | -18683644465447 |
| 23 | -73743457866962 |