A362223 a(n) is the number of n-celled fixed rounded polyominoes.
1, 4, 20, 113, 682, 4294, 27830, 184240, 1239575, 8446660, 58150684, 403735761
Offset: 1
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.
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