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 | 272 |
| 3 | 9963 |
| 4 | 131584 |
| 5 | 978125 |
| 6 | 5042736 |
| 7 | 20185207 |
| 8 | 67125248 |
| 9 | 193739769 |
| 10 | 500050000 |
| 11 | 1179054371 |
| 12 | 2580014592 |
| 13 | 5302435333 |
| 14 | 10330792304 |
| 15 | 19222059375 |
| 16 | 34360262656 |
| 17 | 59294648177 |
| 18 | 99180589968 |
| 19 | 161345086939 |
| 20 | 256001600000 |