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Search: id:A077966
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| A077966 |
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Expansion of 1/(1+2*x^2). |
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+0
5
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| 1, 0, -2, 0, 4, 0, -8, 0, 16, 0, -32, 0, 64, 0, -128, 0, 256, 0, -512, 0, 1024, 0, -2048, 0, 4096, 0, -8192, 0, 16384, 0, -32768, 0, 65536, 0, -131072, 0, 262144, 0, -524288, 0, 1048576, 0, -2097152, 0, 4194304, 0, -8388608, 0, 16777216, 0, -33554432, 0, 67108864, 0, -134217728, 0, 268435456
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Normally sequences like this are not included, since with the alternating 0's deleted it is already in the database.
Inverse binomial transform of A087455 . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 02 2008]
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FORMULA
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a(n)= (1+(-1)^n)*(-2)^(n/2)/2. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 23 2009]
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PROGRAM
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sage: [lucas_number1(n, 0, 2) for n in xrange(1, 58)] - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 16 2008
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CROSSREFS
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Cf. A000079, A077957.
Sequence in context: A046666 A131575 A077957 this_sequence A021102 A021053 A128983
Adjacent sequences: A077963 A077964 A077965 this_sequence A077967 A077968 A077969
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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