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 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 218 |
| 5 | 9608 |
| 6 | 1540944 |
| 7 | 882033440 |
| 8 | 1793359192848 |
| 9 | 13027956824399552 |
| 10 | 341260431952972580352 |
| 11 | 32522909385055886111197440 |
| 12 | 11366745430825400574433894004224 |
| 13 | 14669085692712929869037096075316220928 |
| 14 | 70315656615234999521385506555979904091217920 |