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A144197 Square array 7 x 7 read by rows. 2
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 (list; graph; refs; listen; history; text; internal format)
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: A011690 A341994 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

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Last modified October 22 16:15 EDT 2021. Contains 348174 sequences. (Running on oeis4.)