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 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 33 |
| 4 | 532 |
| 5 | 9609 |
| 6 | 48577 |
| 7 | 58186 |
| 8 | 106763 |
| 9 | 164949 |
| 10 | 271712 |
| 11 | 2066933 |
| 12 | 2338645 |
| 13 | 4405578 |
| 14 | 28772113 |
| 15 | 61949804 |
| 16 | 586320349 |
| 17 | 34068530046 |
| 18 | 34654850395 |
| 19 | 138033081231 |
| 20 | 586787175319 |
| 21 | 1311607431869 |
| 22 | 3210002039057 |
| 23 | 4521609470926 |