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 | 10 |
| 2 | 83 |
| 3 | 732 |
| 4 | 6565 |
| 5 | 59054 |
| 6 | 531447 |
| 7 | 4782976 |
| 8 | 43046729 |
| 9 | 387420498 |
| 10 | 3486784411 |
| 11 | 31381059620 |
| 12 | 282429536493 |
| 13 | 2541865828342 |
| 14 | 22876792454975 |
| 15 | 205891132094664 |
| 16 | 1853020188851857 |
| 17 | 16677181699666586 |
| 18 | 150094635296999139 |
| 19 | 1350851717672992108 |
| 20 | 12157665459056928821 |
| 21 | 109418989131512359230 |