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 | 0 |
| 1 | 1 |
| 2 | 272 |
| 3 | 6642 |
| 4 | 69888 |
| 5 | 391250 |
| 6 | 1806624 |
| 7 | 5767202 |
| 8 | 17895424 |
| 9 | 43584723 |
| 10 | 106420000 |
| 11 | 214373522 |
| 12 | 464196096 |
| 13 | 815759282 |
| 14 | 1568678944 |
| 15 | 2598682500 |
| 16 | 4581294080 |
| 17 | 6975840962 |
| 18 | 11855044656 |
| 19 | 16983693362 |
| 20 | 27343680000 |
| 21 | 38305755684 |
| 22 | 58309597984 |
| 23 | 78311265122 |
| 24 | 118861406208 |
| 25 | 152832421875 |