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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 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..36. 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 Cf. A022166, A057963, A280752. Sequence in context: A059527 A215235 A101457 * A076217 A256784 A324543 Adjacent sequences: A280750 A280751 A280752 * A280754 A280755 A280756 KEYWORD nonn,tabl,more AUTHOR N. J. A. Sloane, Jan 15 2017 STATUS approved

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Last modified September 19 09:52 EDT 2024. Contains 376008 sequences. (Running on oeis4.)