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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 16 |
| 6 | 25 |
| 7 | 25 |
| 8 | 324 |
| 9 | 841 |
| 10 | 1849 |
| 11 | 2601 |
| 12 | 14884 |
| 13 | 18769 |
| 14 | 103041 |
| 15 | 292681 |
| 16 | 774400 |
| 17 | 3400336 |
| 18 | 13307904 |
| 19 | 34892649 |
| 20 | 179399236 |
| 21 | 582643044 |
| 22 | 2008473856 |
| 23 | 4369606609 |
| 24 | 22833627664 |
| 25 | 67113119844 |
| 26 | 251608579236 |
| 27 | 1240247504896 |
| 28 | 3174109249609 |