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 | 1296 |
| 4 | 3312 |
| 5 | 6900 |
| 6 | 15984 |
| 7 | 38232 |
| 8 | 80400 |
| 9 | 197976 |
| 10 | 449228 |
| 11 | 1002540 |
| 12 | 2382720 |
| 13 | 5427180 |
| 14 | 12493160 |
| 15 | 28565504 |
| 16 | 66402540 |
| 17 | 153375600 |
| 18 | 346691720 |
| 19 | 810423876 |
| 20 | 1869448176 |
| 21 | 4247091288 |
| 22 | 9846872812 |
| 23 | 22767034560 |
| 24 | 52106780512 |
| 25 | 119650563196 |