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 | 3 |
| 3 | 4 |
| 4 | 2 |
| 5 | 8 |
| 6 | 14 |
| 7 | 2 |
| 8 | 98 |
| 9 | 194 |
| 10 | 2 |
| 11 | 18818 |
| 12 | 37634 |
| 13 | 2 |
| 14 | 708158978 |
| 15 | 1416317954 |
| 16 | 2 |
| 17 | 1002978273411373058 |
| 18 | 2005956546822746114 |
| 19 | 2 |
| 20 | 2011930833870518011412817828051050498 |
| 21 | 4023861667741036022825635656102100994 |