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 | 8 |
| 2 | 21 |
| 3 | 149 |
| 4 | 526 |
| 5 | 4343 |
| 6 | 29481 |
| 7 | 227270 |
| 8 | 1748201 |
| 9 | 14230080 |
| 10 | 116070258 |
| 11 | 970291863 |
| 12 | 8167942037 |
| 13 | 69515482202 |
| 14 | 595126853497 |
| 15 | 5123195518181 |
| 16 | 44273991533826 |
| 17 | 383829145390407 |
| 18 | 3335510350046976 |
| 19 | 29039638981754848 |
| 20 | 253185283934243073 |