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 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 256 |
| 4 | 4335 |
| 5 | 73441 |
| 6 | 1244160 |
| 7 | 21077281 |
| 8 | 357069615 |
| 9 | 6049106176 |
| 10 | 102477735375 |
| 11 | 1736072395201 |
| 12 | 29410752983040 |
| 13 | 498246728316481 |
| 14 | 8440783628397135 |
| 15 | 142995074954434816 |
| 16 | 2422475490596994735 |