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Search: id:A087621
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| A087621 |
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(1,1) entry of powers of the orthogonal design shown below. |
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+0
3
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| -1, 2, 4, -56, 80, -352, 64, 2176, -4864, 31232, -23552, -14336, 217088, -2056192, 2375680, -7307264, -4390912, 102367232, -169607168, 877133824, -397410304, -3042967552, 9265217536, -68308434944, 62495129600, -78483816448, -342993403904
(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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REFERENCES
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S. Severini, A note on two integer sequences arising from the 3-dimensional hypercube, Technical Report, Department of Computer Science, University of Bristol, Bristol, UK (October 2003).
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FORMULA
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a(0)=1, a(1)=-1, a(2)=2, a(3)=4, a(n)=4a(n-2)-64a(n-4) - T. D. Noe (noe(AT)sspectra.com), Dec 11 2006
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CROSSREFS
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Adjacent sequences: A087618 A087619 A087620 this_sequence A087622 A087623 A087624
Sequence in context: A005274 A121234 A084574 this_sequence A062784 A098626 A012370
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KEYWORD
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easy,sign
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AUTHOR
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Simone Severini (severini(AT)cs.bris.ac.uk), Oct 25 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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