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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.

User: Enrico Formenti

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A275943 Number of prefix-closed polyominoes of area n.

Original entry on oeis.org

1, 2, 6, 19, 61, 197, 640, 2091, 6860, 22566, 74365, 245397, 810639, 2680025, 8865866
Offset: 1

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Enrico Formenti, Aug 13 2016

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Cf. A000105, A001168.

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