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 | 6 |
| 4 | 27 |
| 5 | 190 |
| 6 | 2246 |
| 7 | 48230 |
| 8 | 2016372 |
| 9 | 173567527 |
| 10 | 32121018248 |
| 11 | 13203989190379 |
| 12 | 12355576970413489 |
| 13 | 26815273007684770624 |
| 14 | 136972327635873480206735 |
| 15 | 1666402843785234768663681968 |