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A105352
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Numbers of points on successive rings of the simple square lattice.
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1
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1, 4, 4, 4, 8, 4, 4, 8, 8, 4, 8, 4, 8, 12, 8, 8, 4, 8, 4, 8, 8, 8, 8, 4, 12, 8, 8, 8, 8, 4, 16, 8, 4, 8, 8, 8, 4, 8, 16, 8, 8, 8, 4, 12, 8, 8, 8, 8, 8, 8, 8, 4, 8, 16, 4, 16, 8, 8, 4, 16, 8, 8, 8, 8, 8, 8, 4, 8, 12, 16, 8, 8, 8, 8, 16, 8, 8, 4, 8, 12, 8, 16, 8, 8, 8, 16, 12, 8, 8, 8, 8, 8, 8, 4, 8, 8, 16, 4
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OFFSET
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1,2
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COMMENTS
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This is A004018 with the zero terms omitted.
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LINKS
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EXAMPLE
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a(1) = 1 from (0, 0).
a(2) = 4 from (0, 1), (0, -1), (1, 0), (-1, 0).
a(5) = 8 from (+-1, +-2), (+-2, +-1).
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nice,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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