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 | 5 |
| 2 | 61 |
| 3 | 923 |
| 4 | 15421 |
| 5 | 272755 |
| 6 | 5006275 |
| 7 | 94307855 |
| 8 | 1811113021 |
| 9 | 35301145037 |
| 10 | 696227550811 |
| 11 | 13863654392945 |
| 12 | 278264498108611 |
| 13 | 5622746346645953 |
| 14 | 114268249446672151 |
| 15 | 2333733620675302423 |
| 16 | 47868774493665731645 |
| 17 | 985608360056821004233 |
| 18 | 20362035153323824192645 |