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 | 1 |
| 2 | 9 |
| 3 | 440 |
| 4 | 71344 |
| 5 | 25826824 |
| 6 | 17321581592 |
| 7 | 19304140340736 |
| 8 | 33142988156751360 |
| 9 | 82906630912116006912 |
| 10 | 289508760665893747703808 |
| 11 | 1364207202603804952193826816 |
| 12 | 8438589244471363680258331914240 |
| 13 | 66972265137135031645961782287814656 |
| 14 | 668922701586813036491303458870218731520 |