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 | 5 |
| 3 | 244 |
| 4 | 19090 |
| 5 | 1839075 |
| 6 | 199363606 |
| 7 | 23320604384 |
| 8 | 2876887986028 |
| 9 | 369107300988219 |
| 10 | 48807370374419910 |
| 11 | 6610055144592717246 |
| 12 | 912769451975745598299 |
| 13 | 128087096344387852459658 |
| 14 | 18219369599509083643661044 |
| 15 | 2621701165622760015979876800 |
| 16 | 381039123615762485580377457688 |