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Search: id:A090591
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| 1, 2, -4, -24, -16, 160, 448, -384, -4352, -5632, 23552, 92160, -4096, -745472, -1458176, 3047424, 17760256, 11141120, -119799808, -328728576
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OFFSET
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1,2
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COMMENT
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(1,2) entry of powers of the orthogonal design shown below:
+1 +1 +1 +1 +1 +1 +1 +1
-1 +1 +1 -1 +1 -1 -1 +1
-1 -1 +1 +1 +1 +1 -1 -1
-1 +1 -1 +1 +1 -1 +1 -1
-1 -1 -1 -1 +1 +1 +1 +1
-1 +1 -1 +1 -1 +1 -1 +1
-1 +1 +1 -1 -1 +1 +1 -1
-1 -1 +1 +1 -1 -1 +1 +1
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FORMULA
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Binomial transform of (1+x)/(1+7x^2)
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CROSSREFS
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Cf. A087621, A090590.
Sequence in context: A009313 A009317 A081680 this_sequence A098656 A138611 A068506
Adjacent sequences: A090588 A090589 A090590 this_sequence A090592 A090593 A090594
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KEYWORD
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sign
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AUTHOR
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Simone Severini (ss54(AT)york.ac.uk), Dec 04 2003
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EXTENSIONS
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Formulae from Paul Barry, Dec 05, 2003
Corrected by T. D. Noe (noe(AT)sspectra.com), Dec 11 2006
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