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) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 241 |
| 4 | 1117 |
| 5 | 4891 |
| 6 | 20953 |
| 7 | 88465 |
| 8 | 370753 |
| 9 | 1546879 |
| 10 | 6437929 |
| 11 | 26754673 |
| 12 | 111093277 |
| 13 | 461065507 |
| 14 | 1912995217 |
| 15 | 7935844129 |
| 16 | 32917778401 |
| 17 | 136534855735 |
| 18 | 566294540737 |
| 19 | 2348729268913 |
| 20 | 9741340873213 |
| 21 | 40401894006955 |
| 22 | 167564911503529 |