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 | 3 |
| 2 | 13 |
| 3 | 83 |
| 4 | 814 |
| 5 | 12502 |
| 6 | 303102 |
| 7 | 11681388 |
| 8 | 718217460 |
| 9 | 70660085940 |
| 10 | 11145552305760 |
| 11 | 2823029266531680 |
| 12 | 1149529177121700960 |
| 13 | 753213189796615454400 |
| 14 | 794745942920930023732800 |