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Search: id:A156067
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| A156067 |
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Main diagonal of square array A153130 and successive differences. |
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+0
1
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| 1, 2, -5, -1, -11, -13, -35, -61, -131, -253, -515, -1021, -2051, -4093, -8195, -16381
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n) mod 9=A153130. a(n+1)-2a(n)=0,(period 2:repeat -9,9 =A010734 signed). a(n)= (A154589=4,-1,-2,-4,-8,-16) + period 2:repeat -3,3 (A010701 signed). A154589 is second upper diagonal of SaA153130. Note a(n)+a(n+3)=0,-9,-18,-36,-72,=0,-A005010=-9*A131577, a(2n)+a(2n+1)=3,-6,-24,-96,-384,=3,-A002023.
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CROSSREFS
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Sequence in context: A146104 A120235 A089618 this_sequence A101920 A114494 A118964
Adjacent sequences: A156064 A156065 A156066 this_sequence A156068 A156069 A156070
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KEYWORD
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uned,sign
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 03 2009
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