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 | 30 |
| 1 | 1089 |
| 2 | 29531 |
| 3 | 723680 |
| 4 | 17084650 |
| 5 | 400186050 |
| 6 | 9447948510 |
| 7 | 226861274640 |
| 8 | 5570383618800 |
| 9 | 140328075888000 |
| 10 | 3634144257744000 |
| 11 | 96862561213017600 |
| 12 | 2658662147043302400 |
| 13 | 75165608074100544000 |
| 14 | 2188816503237524160000 |