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 | 0 |
| 2 | 1 |
| 3 | 16 |
| 4 | 143 |
| 5 | 5468 |
| 6 | 199095 |
| 7 | 28216660 |
| 8 | 3855890801 |
| 9 | 2063573357664 |
| 10 | 1084629728348393 |
| 11 | 2257651988909632680 |
| 12 | 4666227312488067563575 |
| 13 | 38431519470524295069404276 |
| 14 | 315759892137678954308707379391 |
| 15 | 10364113216536074591340863505339180 |
| 16 | 339917045534987610111076281503519527705 |