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 | 3 |
| 2 | 34 |
| 3 | 854 |
| 4 | 37556 |
| 5 | 2546852 |
| 6 | 246113904 |
| 7 | 32104625520 |
| 8 | 5433891955968 |
| 9 | 1157778241057152 |
| 10 | 303197684900579712 |
| 11 | 95717977509042032256 |
| 12 | 35847800701044816248064 |
| 13 | 15713483696924130220098816 |
| 14 | 7969364997624587289470810112 |
| 15 | 4630203661005094483980386924544 |