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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; internal format)
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OFFSET
| 0,2
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REFERENCES
| G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 60.
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EXAMPLE
| 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
| Cf. A119931.
Sequence in context: A043090 A023799 A001959 * A173552 A188010 A008320
Adjacent sequences: A119927 A119928 A119929 * A119931 A119932 A119933
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KEYWORD
| nonn,easy,changed
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), May 30 2006
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