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 | 6 |
| 3 | 68 |
| 4 | 1170 |
| 5 | 27142 |
| 6 | 793002 |
| 7 | 27914126 |
| 8 | 1150212810 |
| 9 | 54326011414 |
| 10 | 2894532443154 |
| 11 | 171800282010062 |
| 12 | 11243812043430330 |
| 13 | 804596872359480358 |
| 14 | 62506696942427106498 |
| 15 | 5239819196582605428254 |
| 16 | 471480120474696200252970 |
| 17 | 45328694990444455796547766 |
| 18 | 4637556923393331549190920306 |