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) |
|---|---|
| 8 | 1 |
| 9 | 9 |
| 10 | 81 |
| 11 | 561 |
| 12 | 3817 |
| 13 | 23881 |
| 14 | 147862 |
| 15 | 886028 |
| 16 | 5288933 |
| 17 | 31178901 |
| 18 | 183908244 |
| 19 | 1081452450 |
| 20 | 6381113064 |
| 21 | 37719710024 |
| 22 | 224141652938 |
| 23 | 1337958249446 |
| 24 | 8038507929319 |
| 25 | 48593807722975 |
| 26 | 295913856459150 |
| 27 | 1814986751559300 |
| 28 | 11220842616565050 |
| 29 | 69921225307663290 |