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 | 17 |
| 2 | 272 |
| 3 | 4352 |
| 4 | 69632 |
| 5 | 1114112 |
| 6 | 17825792 |
| 7 | 285212672 |
| 8 | 4563402616 |
| 9 | 73014439680 |
| 10 | 1168231000200 |
| 11 | 18691695448320 |
| 12 | 299067118295040 |
| 13 | 4785073750671360 |
| 14 | 76561177737953280 |
| 15 | 1224978807442636800 |
| 16 | 19599660337248356280 |