id:A161780 - OEIS Search Results

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Square array read by antidiagonals up. Redheffer type matrix. A007427 interleaved with k-1 zeros in the columns.

+0
1

1, -2, 1, -2, 1, 1, 1, 0, 0, 1, -2, -2, 1, 0, 1, 4, 0, 0, 0, 0, 1, -2, -2, 0, 1, 0, 0, 1, 0, 0, -2, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, -2, -2, -2, 0, 1, 0, 0, 0, 0, 1, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -2, 4, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 4, 0, 1 (list; table; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The determinant of this matrix is A006218.`
	EXAMPLE	`Table begins:` `..1..1..1..1..1..1..1..1` `.-2..1..0..0..0..0..0..0` `.-2..0..1..0..0..0..0..0` `..1.-2..0..1..0..0..0..0` `.-2..0..0..0..1..0..0..0` `..4.-2.-2..0..0..1..0..0` `.-2..0..0..0..0..0..1..0` `..0..1..0.-2..0..0..0..1`
	PROGRAM	`(Other) (Excel cell formula): =if(row()=1; 1; if(mod(row(); column())=0; 1*lookup(row()/column(); A000027; A007427); 0))`
	CROSSREFS	`Cf. A007427, A006218, A002321.` `Sequence in context: A029443 A078508 A029416 this_sequence A136571 A108149 A128583` `Adjacent sequences: A161777 A161778 A161779 this_sequence A161781 A161782 A161783`
	KEYWORD	`sign,tabl`
	AUTHOR	`Mats Granvik (mats.granvik(AT)abo.fi), Jun 19 2009`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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