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 | 2 |
| 2 | 8 |
| 3 | 64 |
| 4 | 768 |
| 5 | 11264 |
| 6 | 184320 |
| 7 | 3227648 |
| 8 | 59179008 |
| 9 | 1121714176 |
| 10 | 21803040768 |
| 11 | 432218832896 |
| 12 | 8705009516544 |
| 13 | 177618573852672 |
| 14 | 3663840373899264 |
| 15 | 76277945940836352 |
| 16 | 1600706475536154624 |
| 17 | 33823752545680490496 |
| 18 | 719051629204296695808 |
| 19 | 15368152475218787434496 |