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 | 26 |
| 3 | 216 |
| 4 | 2171 |
| 5 | 25628 |
| 6 | 348050 |
| 7 | 5352788 |
| 8 | 92056223 |
| 9 | 1752149568 |
| 10 | 36591725976 |
| 11 | 832352590164 |
| 12 | 20493399785598 |
| 13 | 543168774618834 |
| 14 | 15424012639825146 |
| 15 | 467276557333020682 |
| 16 | 15046702103550879196 |
| 17 | 513273141160665106150 |