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 | 10 |
| 1 | 25 |
| 2 | 160 |
| 3 | 1225 |
| 4 | 9610 |
| 5 | 75625 |
| 6 | 595360 |
| 7 | 4687225 |
| 8 | 36902410 |
| 9 | 290532025 |
| 10 | 2287353760 |
| 11 | 18008298025 |
| 12 | 141779030410 |
| 13 | 1116223945225 |
| 14 | 8788012531360 |
| 15 | 69187876305625 |
| 16 | 544714997913610 |
| 17 | 4288532107003225 |
| 18 | 33763541858112160 |
| 19 | 265819802757894025 |
| 20 | 2092794880205040010 |
| 21 | 16476539238882426025 |