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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 Alberto 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 October 1 22:45 EDT 2022. Contains 357173 sequences. (Running on oeis4.)