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 | 4 |
| 2 | 32 |
| 3 | 336 |
| 4 | 4256 |
| 5 | 63072 |
| 6 | 1076128 |
| 7 | 20900032 |
| 8 | 457645984 |
| 9 | 11201485632 |
| 10 | 304074996512 |
| 11 | 9089787596288 |
| 12 | 297305835048096 |
| 13 | 10578368788224320 |
| 14 | 407327197600166304 |
| 15 | 16894650230806939776 |
| 16 | 751638529171350907808 |