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Search: id:A141516
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| A141516 |
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Principal diagonal of A141425 (1, 2, 4, 5, 7, 8) and differences. |
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+0
1
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| 1, 2, 1, -7, -23, -1, 7, -103, -251, -133, -149, -1387, -3143, -3001
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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(*) b(n)/3 signed from -24 = A009117,expansion of cos(x)^2.
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FORMULA
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Note b(n)=a(2n)+a(2n+1)= 3, -6, -24, -96, -384, -1536 = 3, -A002023 = 3, -3*A081294(n+1) (*) . a(4n)+a(4n+1)+a(4n+2)+a(4n+3)= -3, -120, -1920 . a(4n+2)+a(4n+3)+a(4n+4)+a(4n+5)= -30, -480, -7680 = -30*A001025 .
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CROSSREFS
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Sequence in context: A012893 A013075 A009281 this_sequence A138346 A085073 A131288
Adjacent sequences: A141513 A141514 A141515 this_sequence A141517 A141518 A141519
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KEYWORD
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sign,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Aug 11 2008
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