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A238973
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The number of arcs from odd to even level vertices in divisor lattice in canonical order.
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3
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0, 0, 1, 2, 1, 3, 6, 2, 5, 6, 10, 16, 2, 6, 8, 14, 16, 26, 40, 3, 8, 11, 18, 12, 23, 36, 27, 42, 64, 96, 3, 9, 13, 22, 15, 29, 46, 32, 37, 58, 88, 67, 102, 152, 224, 4, 11, 16, 26, 19, 36, 56, 20, 41, 48, 74, 112, 52, 80, 93, 140, 208, 108, 162, 240, 352, 512
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OFFSET
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0,4
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LINKS
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FORMULA
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T(n,k) = floor(A238964(n,k)/2). (End)
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EXAMPLE
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Triangle T(n,k) begins:
0;
0;
1, 2;
1, 3, 6;
2, 5, 6, 10, 16;
2, 6, 8, 14, 16, 26, 40;
3, 8, 11, 18, 12, 23, 36, 27, 42, 64, 96;
...
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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EXTENSIONS
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Offset changed and terms a(50) and beyond from Andrew Howroyd, Mar 28 2020
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STATUS
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approved
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