A054100 T(n,n), array T as in A054098.
1, 2, 2, 4, 10, 34, 144, 748, 4606, 32874, 266968, 2431612, 24554190, 272289634, 3289836256, 43017800316, 605289111694, 9119314568458, 146474344313976, 2498617856687404
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.