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 | 7 |
| 2 | 120 |
| 3 | 1921 |
| 4 | 30624 |
| 5 | 488071 |
| 6 | 7778520 |
| 7 | 123968257 |
| 8 | 1975713600 |
| 9 | 31487449351 |
| 10 | 501823476024 |
| 11 | 7997688167041 |
| 12 | 127461187196640 |
| 13 | 2031381306979207 |
| 14 | 32374639724470680 |
| 15 | 515962854284551681 |
| 16 | 8223031028828356224 |