A280752 - OEIS

A280752

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

1, 1, 1, 1, 1, 1, 1, 3, 10, 1, 1, 2, 865, 71, 1, 1, 5, 2630, 1427, 181, 1, 1, 3, 163133, 306553, 36667, 145, 1, 1, 7, 3368938, 129115655, 46958822, 43662, 4036, 1

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OFFSET

1,8

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:

1/3, 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, A280753.

Sequence in context: A212361 A011998 A278759 * A182303 A165590 A234935

Adjacent sequences: A280749 A280750 A280751 * A280753 A280754 A280755

KEYWORD

nonn,tabl,more

AUTHOR

N. J. A. Sloane, Jan 15 2017

STATUS

approved