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A331152
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Triangle read by rows: T(n,k) (n>=k>=1) = f(n,n-k+1) where f(n,k) = ceiling((n/k)*floor(n/k)).
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0
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1, 1, 4, 1, 2, 9, 1, 2, 4, 16, 1, 2, 2, 5, 25, 1, 2, 2, 4, 9, 36, 1, 2, 2, 2, 5, 11, 49, 1, 2, 2, 2, 4, 6, 16, 64, 1, 2, 2, 2, 2, 5, 9, 18, 81, 1, 2, 2, 2, 2, 4, 5, 10, 25, 100, 1, 2, 2, 2, 2, 2, 5, 6, 11, 28, 121, 1, 2, 2, 2, 2, 2, 4, 5, 9, 16, 36, 144, 1, 2, 2, 2, 2, 2, 2, 5, 6, 10, 18, 39, 169
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OFFSET
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1,3
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LINKS
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Robert J. McEliece and Herbert Taylor, Covering tori with squares, Journal of Combinatorial Theory, Series A 14.1 (1973): 119-124.
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EXAMPLE
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Triangle begins:
1,
1, 4,
1, 2, 9,
1, 2, 4, 16,
1, 2, 2, 5, 25,
1, 2, 2, 4, 9, 36,
1, 2, 2, 2, 5, 11, 49,
1, 2, 2, 2, 4, 6, 16, 64,
1, 2, 2, 2, 2, 5, 9, 18, 81,
1, 2, 2, 2, 2, 4, 5, 10, 25, 100,
1, 2, 2, 2, 2, 2, 5, 6, 11, 28, 121,
1, 2, 2, 2, 2, 2, 4, 5, 9, 16, 36, 144,
1, 2, 2, 2, 2, 2, 2, 5, 6, 10, 18, 39, 169,
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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