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 | 40 |
| 2 | 1600 |
| 3 | 9240 |
| 4 | 53361 |
| 5 | 175560 |
| 6 | 577600 |
| 7 | 1432600 |
| 8 | 3553225 |
| 9 | 7419360 |
| 10 | 15492096 |
| 11 | 28791840 |
| 12 | 53509225 |
| 13 | 91408240 |
| 14 | 156150016 |
| 15 | 250232400 |
| 16 | 401000625 |
| 17 | 611163000 |
| 18 | 931470400 |
| 19 | 1363358920 |
| 20 | 1995498241 |
| 21 | 2824994040 |
| 22 | 3999297600 |
| 23 | 5505737640 |