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 | 1 |
| 1 | 12 |
| 2 | 138 |
| 3 | 1830 |
| 4 | 28805 |
| 5 | 535004 |
| 6 | 11568197 |
| 7 | 287143993 |
| 8 | 8077888153 |
| 9 | 254672147047 |
| 10 | 8910929460415 |
| 11 | 343135184110984 |
| 12 | 14435616939387951 |
| 13 | 659276261774240232 |
| 14 | 32504007393860850275 |
| 15 | 1721495715845423489806 |
| 16 | 97516667477625085469176 |