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 | 1025 |
| 3 | 59050 |
| 4 | 1049600 |
| 5 | 9765626 |
| 6 | 60526250 |
| 7 | 282475250 |
| 8 | 1074790400 |
| 9 | 3486843450 |
| 10 | 10009766650 |
| 11 | 25937424602 |
| 12 | 61978880000 |
| 13 | 137858491850 |
| 14 | 289537131250 |
| 15 | 576660215300 |
| 16 | 1100585369600 |
| 17 | 2015993900450 |
| 18 | 3574014536250 |
| 19 | 6131066257802 |
| 20 | 10250001049600 |
| 21 | 16680163512500 |
| 22 | 26585860217050 |