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 A119931 Sum of the numbers of the matrix A111490 along a boustrophedon path: a11, a11+a21, a11+a21+a21, etc. 1
 1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 13, 15, 18, 20, 21, 22, 24, 27, 28, 29, 30 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 60. LINKS 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+2, 1+1+1+1+2+1+1+2+1, 1+1+1+1+2+1+1+2+1+1, ... That is 1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 13, 15, 18, 20, etc. CROSSREFS Cf. A119930. Sequence in context: A039149 A039081 A195128 * A129989 A187572 A184478 Adjacent sequences:  A119928 A119929 A119930 * A119932 A119933 A119934 KEYWORD nonn,easy AUTHOR Paolo P. Lava and Giorgio Balzarotti, May 30 2006 STATUS approved

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Last modified March 19 23:02 EDT 2019. Contains 321343 sequences. (Running on oeis4.)