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 | 25 |
| 2 | 324 |
| 3 | 2900 |
| 4 | 20149 |
| 5 | 115805 |
| 6 | 572975 |
| 7 | 2507895 |
| 8 | 9904050 |
| 9 | 35818770 |
| 10 | 120016066 |
| 11 | 376029250 |
| 12 | 1110031585 |
| 13 | 3106677225 |
| 14 | 8286768736 |
| 15 | 21161266240 |
| 16 | 51931463950 |
| 17 | 122883804990 |
| 18 | 281186004075 |
| 19 | 623785796595 |
| 20 | 1344621849285 |
| 21 | 2822018693325 |
| 22 | 5776896838830 |
| 23 | 11553274693950 |