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 | -14 |
| 1 | -90 |
| 2 | -722 |
| 3 | -4830 |
| 4 | -33554 |
| 5 | -228954 |
| 6 | -1572110 |
| 7 | -10768122 |
| 8 | -73825010 |
| 9 | -505954014 |
| 10 | -3467991794 |
| 11 | -23769625530 |
| 12 | -162920337422 |
| 13 | -1116670248090 |
| 14 | -7653777913874 |
| 15 | -52459758093534 |
| 16 | -359564573392850 |
| 17 | -2464492138756122 |
| 18 | -16891880703949070 |
| 19 | -115778671987640634 |