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 | 7 |
| 2 | 22 |
| 3 | 148 |
| 4 | 472 |
| 5 | 2632 |
| 6 | 14944 |
| 7 | 25312 |
| 8 | 349312 |
| 9 | 1645312 |
| 10 | 16274560 |
| 11 | 27565312 |
| 12 | 163240960 |
| 13 | 1637104000 |
| 14 | 17758898176 |
| 15 | 36261548032 |
| 16 | 18847289344 |
| 17 | 1280655450112 |
| 18 | 5778613350400 |
| 19 | 42629361516544 |
| 20 | 219654008209408 |
| 21 | 137946306445312 |
| 22 | 4629754071040000 |
| 23 | 53702255633760256 |
| 24 | 9828354353004544 |
| 25 | 404693465879805952 |