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Search: id:A058920
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A058920 2n^4 + 2n^3 + 3n^2 + 2n + 1. +0
1
1, 10, 65, 250, 697, 1586, 3145, 5650, 9425, 14842, 22321, 32330, 45385, 62050, 82937, 108706, 140065, 177770, 222625, 275482, 337241, 408850, 491305, 585650, 692977, 814426, 951185, 1104490, 1275625, 1465922, 1676761, 1909570, 2165825 (list; graph; listen)
OFFSET

0,2

COMMENT

On a 2n X (n^2 - n + 1) X n^2 cuboid (with n >= 3) there are six pairs of points with the maximum surface distance between them: the four pairs of opposite corners and the opposite pairs of points on the smallest faces 1 in from the mid-points of the shortest edges; this maximum surface distance is sqrt(a(n)).

LINKS

Source

CROSSREFS

For n >= 2 the sequence is a subsequence of A007692.

Sequence in context: A061183 A033863 A033908 this_sequence A059598 A133715 A023009

Adjacent sequences: A058917 A058918 A058919 this_sequence A058921 A058922 A058923

KEYWORD

nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Jan 11 2001

page 1

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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