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 | 1 |
| 1 | 26 |
| 2 | 650 |
| 3 | 16250 |
| 4 | 405925 |
| 5 | 10140000 |
| 6 | 253297200 |
| 7 | 6327360000 |
| 8 | 158057355300 |
| 9 | 3948270300000 |
| 10 | 98627731207200 |
| 11 | 2463719204700000 |
| 12 | 61543667742382800 |
| 13 | 1537359871188960000 |
| 14 | 38403225875902867200 |
| 15 | 959311990194611040000 |