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 | 5 |
| 2 | 57 |
| 3 | 417 |
| 4 | 3249 |
| 5 | 25533 |
| 6 | 199489 |
| 7 | 1560161 |
| 8 | 12202673 |
| 9 | 95434773 |
| 10 | 746388537 |
| 11 | 5837454753 |
| 12 | 45654295713 |
| 13 | 357058903853 |
| 14 | 2792531543489 |
| 15 | 21840184444225 |
| 16 | 170810481722657 |
| 17 | 1335896257560101 |
| 18 | 10447946710663673 |
| 19 | 81712625405191841 |