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 | 1088 |
| 3 | 89667 |
| 4 | 2105344 |
| 5 | 24453125 |
| 6 | 181538496 |
| 7 | 989075143 |
| 8 | 4296015872 |
| 9 | 15692921289 |
| 10 | 50005000000 |
| 11 | 142665578891 |
| 12 | 371522101248 |
| 13 | 896111571277 |
| 14 | 2024835291584 |
| 15 | 4324963359375 |
| 16 | 8796227239936 |
| 17 | 17136153323153 |
| 18 | 32134511149632 |
| 19 | 58245576384979 |
| 20 | 102400640000000 |
| 21 | 175139650815381 |
| 22 | 292160397884608 |