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 | 4 |
| 3 | 22 |
| 4 | 162 |
| 5 | 1830 |
| 6 | 24270 |
| 7 | 418350 |
| 8 | 8040810 |
| 9 | 186597510 |
| 10 | 5447823150 |
| 11 | 169904387730 |
| 12 | 6317118448410 |
| 13 | 260105476071210 |
| 14 | 11228680258518030 |
| 15 | 529602053223499410 |
| 16 | 28154196550210460730 |
| 17 | 1665532558389396767070 |