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Search: id:A130668
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| 0, 0, 1, -2, 5, -11, 23, -48, 102, -220, 476, -1024
(list; graph; listen)
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OFFSET
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0,4
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FORMULA
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A124072 must be consulted . We change the sign of every negative number and consider the differences of every line. Hence for the second line and followers the four terms periodic sequences:
0 1 -1 1 0
1 0 0 1 1
1 0 1 2 1
1 1 3 3 1
2 4 6 4 2
6 10 10 6 6
16 20 16 12 16
36 36 28 28 36
72 64 56 64 72
136 120 120 136 136
256 240 256 272 256
They are linked together : 272=136+136, 256=120+136, 240=120+120, 256=136+120 . The 4 columns are almost known (must the first line be suppressed?) :A038503 (without the first 1),A000749 (without the first 0),A038505, A038504 G. Adamson (two days ago,I submited 1 1 0 0 without knowing Adamson comment . Like the present one, every sequence of A124072 begining by a negative number (-2,-11..) is a "twisted" sequence (see A129339 comments,A129961 and the present 4 columns) . Periodic 2^n .
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CROSSREFS
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Adjacent sequences: A130665 A130666 A130667 this_sequence A130669 A130670 A130671
Sequence in context: A059411 A126017 A034468 this_sequence A083380 A018112 A067149
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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), Jun 27 2007
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