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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 18 |
| 5 | 71 |
| 6 | 356 |
| 7 | 2097 |
| 8 | 14212 |
| 9 | 105821 |
| 10 | 887576 |
| 11 | 8093601 |
| 12 | 81310936 |
| 13 | 876456695 |
| 14 | 10257217440 |
| 15 | 127631146697 |
| 16 | 1705775408656 |