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Denominators of triangle related to enumeration of minimal 2-covers of a labeled n-set.
1

%I #15 Feb 13 2023 14:45:01

%S 1,3,3,7,2,7,15,5,21,15,31,3,651,186,31,63,7,651,651,651,63,127,4,

%T 11811,15748,11811,762,127,255,9,66929,602361,602361,10795,32385,255

%N Denominators of triangle related to enumeration of minimal 2-covers of a labeled n-set.

%H Octavio A. Agustín-Aquino, <a href="http://arxiv.org/abs/1602.05279">Archimedes' quadrature of the parabola and minimal covers</a>, arXiv:1602.05279 [math.CO], 2016.

%e Triangle begins:

%e 1,

%e 1/3, 1/3,

%e 1/7, 1/2, 1/7,

%e 1/15, 3/5, 10/21, 1/15,

%e 1/31, 2/3, 865/651, 71/186, 1/31,

%e 1/63, 5/7, 2630/651, 1427/651, 181/651, 1/63,

%e 1/127, 3/4, 163133/11811, 306553/15748, 36667/11811, 145/762, 1/127,

%e ...

%Y Cf. A022166, A057963, A280752.

%K nonn,tabl,more

%O 1,2

%A _N. J. A. Sloane_, Jan 15 2017