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Search: id:A090590
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| A090590 |
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(1,1) entry of powers of the orthogonal design shown below. |
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+0
2
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| 1, -6, -20, 8, 176, 288, -832, -3968, -1280, 29184, 68608, -96256, -741376, -712704, 4505600, 14712832, -6619136, -130940928, -208928768, 629669888
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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+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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G.f.: (1-x)/(1-2x+8x^2) - T. D. Noe (noe(AT)sspectra.com), Dec 11 2006
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CROSSREFS
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Cf. A087621, A090591.
Sequence in context: A041066 A060748 A075251 this_sequence A002566 A087998 A096823
Adjacent sequences: A090587 A090588 A090589 this_sequence A090591 A090592 A090593
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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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Corrected by T. D. Noe (noe(AT)sspectra.com), Dec 11 2006
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