A081137 Duplicate of A027474.
0, 0, 1, 21, 294, 3430, 36015, 352947, 3294172, 29647548, 259416045, 2219448385
Offset: 0
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.