A144197 - OEIS

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A144197

Square array 7 x 7 read by rows.

0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0

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OFFSET

1,1

COMMENTS

Permutation contributing to the determinant that gives the 7th value of the Möbius function. Determinant of matrix is equal to -1. The array is symmetrical.

LINKS

Table of n, a(n) for n=1..49.

Herbert S. Wilf, The Redheffer matrix of a partially ordered set, arXiv:math/0408263 [math.CO], 2004.

EXAMPLE

The array is:

0,0,0,0,0,0,1

0,1,0,0,0,0,0

0,0,1,0,0,0,0

0,0,0,1,0,0,0

0,0,0,0,1,0,0

0,0,0,0,0,1,0

1,0,0,0,0,0,0

CROSSREFS

Cf. A143104, A002033, A144196, A144198.

Sequence in context: A341994 A364693 A011688 * A295875 A011676 A277147

Adjacent sequences: A144194 A144195 A144196 * A144198 A144199 A144200

KEYWORD

fini,full,nonn,tabf

AUTHOR

Mats Granvik, Sep 13 2008

STATUS

approved