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 | 6 |
| 2 | 26 |
| 3 | 156 |
| 4 | 626 |
| 5 | 3756 |
| 6 | 16276 |
| 7 | 97656 |
| 8 | 390626 |
| 9 | 2343756 |
| 10 | 10156276 |
| 11 | 60937656 |
| 12 | 244531876 |
| 13 | 1467191256 |
| 14 | 6357828776 |
| 15 | 38146972656 |
| 16 | 152587890626 |
| 17 | 915527343756 |
| 18 | 3967285156276 |
| 19 | 23803710937656 |
| 20 | 95520019531876 |
| 21 | 573120117191256 |