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 | 3 |
| 2 | 72 |
| 3 | 1557 |
| 4 | 36928 |
| 5 | 986550 |
| 6 | 29641608 |
| 7 | 994006209 |
| 8 | 36887753216 |
| 9 | 1502798312547 |
| 10 | 66730937637400 |
| 11 | 3209318261685690 |
| 12 | 166242143849148864 |
| 13 | 9229638177763268395 |
| 14 | 546842961612529341032 |
| 15 | 34443269219453881669425 |