id:A078126 - OEIS Search Results

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Negative determinant of n X n matrix M_{i,j}=1 if i=j or i+j=1 (mod 2 ).

+0
3

-1, -1, 0, 1, 3, 5, 8, 11, 15, 19, 24, 29, 35, 41, 48, 55, 63, 71, 80, 89, 99, 109, 120, 131, 143, 155, 168, 181, 195, 209, 224, 239, 255, 271, 288, 305, 323, 341, 360, 379, 399, 419, 440, 461, 483, 505, 528, 551, 575, 599, 624, 649, 675, 701, 728, 755, 783, 811 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`a(n) = A002620(n) - 1.`
	FORMULA	`G.f.: (-1+x+2x^2-x^3)/((1-x^2)(1-x)^2).`
	CROSSREFS	`a(n)=A002623(n-2)-A002623(n-3)-1, n>=0. a(n)=A024026(n-1), n>1.` `Sequence in context: A001463 A145197 A024169 this_sequence A024206 A159325 A049706` `Adjacent sequences: A078123 A078124 A078125 this_sequence A078127 A078128 A078129`
	KEYWORD	`sign,easy,nice`
	AUTHOR	`Michael Somos, Nov 18 2002`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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