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 | 2 |
| 2 | 10 |
| 3 | 114 |
| 4 | 1322 |
| 5 | 16428 |
| 6 | 214660 |
| 7 | 2897424 |
| 8 | 40046134 |
| 9 | 563527294 |
| 10 | 8042361426 |
| 11 | 116083167058 |
| 12 | 1691193906828 |
| 13 | 24830916046462 |
| 14 | 366990100477712 |
| 15 | 5454733737618820 |
| 16 | 81475220265330158 |
| 17 | 1222209564554562110 |
| 18 | 18404140554678144630 |
| 19 | 278069131820486935046 |
| 20 | 4214088001120913287256 |
| 21 | 64037903464421065585244 |