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Search: id:A118713
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| 4, -20, 361, -3567, 218053, -3455872, 736439027, -16245418225, 1519211613654
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Semiprime analogue of A066933 Circulant of prime numbers. a(n) alternates in sign. A048954 Wendt determinant of n-th circulant matrix C(n). A052182 Circulant of natural numbers. A086459 Circulant of powers of 2.
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LINKS
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Eric Weisstein's World of Mathematics, Circulant Matrix.
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EXAMPLE
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a(2) = -20 = determinant
|4,6|
|6,4|.
a(3) = 361 = 19^2 = determinant
|4,6,9|
|9,4,6|
|6,9,4|.
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CROSSREFS
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Cf. A001358, A048954, A052182, A066933, A086459, A086569.
Sequence in context: A120599 A012797 A054465 this_sequence A160703 A132511 A144989
Adjacent sequences: A118710 A118711 A118712 this_sequence A118714 A118715 A118716
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KEYWORD
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easy,sign
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), May 20 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com) at the suggestion of Andrew Plewe, Aug 23 2007
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