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A280753
Denominators of triangle related to enumeration of minimal 2-covers of a labeled n-set.
1
1, 3, 3, 7, 2, 7, 15, 5, 21, 15, 31, 3, 651, 186, 31, 63, 7, 651, 651, 651, 63, 127, 4, 11811, 15748, 11811, 762, 127, 255, 9, 66929, 602361, 602361, 10795, 32385, 255
OFFSET
1,2
LINKS
Octavio A. Agustín-Aquino, Archimedes' quadrature of the parabola and minimal covers, arXiv:1602.05279 [math.CO], 2016.
EXAMPLE
Triangle begins:
1,
1/3, 1/3,
1/7, 1/2, 1/7,
1/15, 3/5, 10/21, 1/15,
1/31, 2/3, 865/651, 71/186, 1/31,
1/63, 5/7, 2630/651, 1427/651, 181/651, 1/63,
1/127, 3/4, 163133/11811, 306553/15748, 36667/11811, 145/762, 1/127,
...
CROSSREFS
KEYWORD
nonn,tabl,more
AUTHOR
N. J. A. Sloane, Jan 15 2017
STATUS
approved