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 | -7 |
| 1 | -12 |
| 2 | -24 |
| 3 | -12 |
| 4 | 360 |
| 5 | 3738 |
| 6 | 28812 |
| 7 | 201672 |
| 8 | 1355112 |
| 9 | 8936070 |
| 10 | 58427226 |
| 11 | 380724552 |
| 12 | 2479017996 |
| 13 | 16151245488 |
| 14 | 105359408760 |
| 15 | 688338793488 |
| 16 | 4504288103784 |
| 17 | 29521135717470 |
| 18 | 193771020939510 |
| 19 | 1273649831269200 |
| 20 | 8382448392851610 |
| 21 | 55234026483856110 |
| 22 | 364347399072847320 |