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A119930
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Sum of the numbers of the matrix A111490 along a boustrophedon path: a11, a11+a12, a11+a12+a21, etc.
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1
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1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 15, 18, 20, 21, 22, 23, 24, 27, 29, 30
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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REFERENCES
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G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 60.
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LINKS
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EXAMPLE
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If we rewrite the matrix putting on the top the upper left edge and then we sum the numbers following a boustrophedon path we have:
.............1.\
..........._____\
........../1...1.
........./_________
.........1...2...1.\
......______________\
...../.1...2...1...1.
..../__________________
.....1...2...3...2...1.\
..______________________\
..1...2...3...1...1...1.
then
1, 1+1, 1+1+1, 1+1+1+1, 1+1+1+1+2, 1+1+1+1+2+1, 1+1+1+1+2+1+1, 1+1+1+1+2+1+1+1, 1+1+1+1+2+1+1+1+2, 1+1+1+1+2+1+1+1+2+1, ...
That is 1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 15, 18, 20, etc.
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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