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 | 3 |
| 2 | 14 |
| 3 | 159 |
| 4 | 2653 |
| 5 | 58979 |
| 6 | 323846 |
| 7 | 2643383 |
| 8 | 27950288 |
| 9 | 419716939 |
| 10 | 9375105820 |
| 11 | 97494459230 |
| 12 | 781640628620 |
| 13 | 8998628034825 |
| 14 | 34211706798214 |
| 15 | 808651328230664 |
| 16 | 7093844609550582 |
| 17 | 23172535940812848 |
| 18 | 111745028410270193 |
| 19 | 8521105559644622948 |
| 20 | 95493038196442881097 |