A119930 Sum of the numbers of the matrix A111490 along a boustrophedon path: a11, a11+a12, a11+a12+a21, etc.
1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 15, 18, 20, 21, 22, 23, 24, 27, 29, 30
Offset: 0
Examples
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.
References
- G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 60.
Crossrefs
Cf. A119931.