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 | 21 |
| 2 | 245 |
| 3 | 2401 |
| 4 | 21609 |
| 5 | 184877 |
| 6 | 1529437 |
| 7 | 12353145 |
| 8 | 98001617 |
| 9 | 766718533 |
| 10 | 5931980229 |
| 11 | 45478515089 |
| 12 | 346032180025 |
| 13 | 2616003280989 |
| 14 | 19668469112621 |
| 15 | 147174406808233 |
| 16 | 1096686708796833 |
| 17 | 8142067989552245 |
| 18 | 60251303122686613 |
| 19 | 444556912229552577 |
| 20 | 3271482918202092041 |