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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 85 |
| 3 | 1099 |
| 4 | 14281 |
| 5 | 185647 |
| 6 | 2413405 |
| 7 | 31374259 |
| 8 | 407865361 |
| 9 | 5302249687 |
| 10 | 68929245925 |
| 11 | 896080197019 |
| 12 | 11649042561241 |
| 13 | 151437553296127 |
| 14 | 1968688192849645 |
| 15 | 25592946507045379 |
| 16 | 332708304591589921 |
| 17 | 4325207959690668967 |
| 18 | 56227703475978696565 |
| 19 | 730960145187723055339 |
| 20 | 9502481887440399719401 |