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 | 8 |
| 1 | 8 |
| 2 | 15 |
| 3 | 43 |
| 4 | 169 |
| 5 | 841 |
| 6 | 5041 |
| 7 | 35281 |
| 8 | 282241 |
| 9 | 2540161 |
| 10 | 25401601 |
| 11 | 279417601 |
| 12 | 3353011201 |
| 13 | 43589145601 |
| 14 | 610248038401 |
| 15 | 9153720576001 |
| 16 | 146459529216001 |
| 17 | 2489811996672001 |
| 18 | 44816615940096001 |
| 19 | 851515702861824001 |
| 20 | 17030314057236480001 |
| 21 | 357636595201966080001 |