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A331150
Triangle read by rows: T(n,k) (n>=k>=1) = f(n,n-k+1) where f(n,k) = floor((n/k)*ceiling(n/k)).
0
1, 1, 4, 1, 3, 9, 1, 2, 4, 16, 1, 2, 3, 7, 25, 1, 2, 3, 4, 9, 36, 1, 2, 2, 3, 7, 14, 49, 1, 2, 2, 3, 4, 8, 16, 64, 1, 2, 2, 3, 3, 6, 9, 22, 81, 1, 2, 2, 2, 3, 4, 7, 13, 25, 100, 1, 2, 2, 2, 3, 3, 6, 8, 14, 33, 121, 1, 2, 2, 2, 3, 3, 4, 7, 9, 16, 36, 144, 1, 2, 2, 2, 2, 3, 3, 6, 7, 13, 21, 45, 169
OFFSET
1,3
LINKS
Robert J. McEliece and Herbert Taylor, Covering tori with squares, Journal of Combinatorial Theory, Series A 14.1 (1973): 119-124.
EXAMPLE
Triangle begins:
1,
1, 4,
1, 3, 9,
1, 2, 4, 16,
1, 2, 3, 7, 25,
1, 2, 3, 4, 9, 36,
1, 2, 2, 3, 7, 14, 49,
1, 2, 2, 3, 4, 8, 16, 64,
1, 2, 2, 3, 3, 6, 9, 22, 81,
1, 2, 2, 2, 3, 4, 7, 13, 25, 100,
1, 2, 2, 2, 3, 3, 6, 8, 14, 33, 121,
1, 2, 2, 2, 3, 3, 4, 7, 9, 16, 36, 144,
1, 2, 2, 2, 2, 3, 3, 6, 7, 13, 21, 45, 169,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jan 14 2020
STATUS
approved