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 | 18 |
| 2 | 486 |
| 3 | 8748 |
| 4 | 131220 |
| 5 | 1771470 |
| 6 | 22320522 |
| 7 | 267846264 |
| 8 | 3099363912 |
| 9 | 34867844010 |
| 10 | 383546284110 |
| 11 | 4142299868388 |
| 12 | 44059007691036 |
| 13 | 462619580755878 |
| 14 | 4804126415541810 |
| 15 | 49413871702715760 |
| 16 | 504021491367700752 |