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 | 8193 |
| 3 | 1602516 |
| 4 | 68711380 |
| 5 | 1289414505 |
| 6 | 14350108521 |
| 7 | 111239118928 |
| 8 | 660994932816 |
| 9 | 3202860761145 |
| 10 | 13202860761145 |
| 11 | 47725572905076 |
| 12 | 154718778284148 |
| 13 | 457593884876401 |
| 14 | 1251308658130545 |
| 15 | 3197503726489920 |