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 | 9 |
| 2 | 81 |
| 3 | 756 |
| 4 | 7290 |
| 5 | 72171 |
| 6 | 729729 |
| 7 | 7505784 |
| 8 | 78298974 |
| 9 | 826489170 |
| 10 | 8811646074 |
| 11 | 94753804536 |
| 12 | 1026499549140 |
| 13 | 11192793160815 |
| 14 | 122744496427425 |
| 15 | 1352917116177840 |
| 16 | 14979996753469110 |
| 17 | 166542316847391870 |
| 18 | 1858400773709785470 |
| 19 | 20806975169765062200 |
| 20 | 233671377667405024620 |