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 | 0 |
| 1 | 1 |
| 2 | 14 |
| 3 | 225 |
| 4 | 3584 |
| 5 | 57121 |
| 6 | 910350 |
| 7 | 14508481 |
| 8 | 231225344 |
| 9 | 3685097025 |
| 10 | 58730327054 |
| 11 | 936000135841 |
| 12 | 14917271846400 |
| 13 | 237740349406561 |
| 14 | 3788928318658574 |
| 15 | 60385112749130625 |
| 16 | 962372875667431424 |
| 17 | 15337580897929772161 |
| 18 | 244438921491208923150 |
| 19 | 3895685162961412998241 |