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A133728
2
1, 0, 3, 1, 0, 5, 0, 3, 0, 7, 1, 0, 5, 0, 9, 0, 3, 0, 7, 0, 11, 1, 0, 5, 0, 9, 0, 13, 0, 3, 0, 7, 0, 11, 0, 15, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 1, 0, 5, 0, 9, 0, 13, 0, 17, 0, 21, 0, 3, 0, 7, 0, 11, 0, 15, 0, 19, 0, 23
OFFSET
1,3
COMMENTS
Row sums are the triangular numbers 1, 3, 6, 10, 15, 21, 28, ...; see A000217.
FORMULA
A128174 * A127775 as infinite lower triangular matrices. Triangle by columns: (2k-1, 0, 2k-1, 0, ...) in k-th column.
EXAMPLE
From Philippe Deléham, Oct 28 2011: (Start)
Triangle begins:
1;
0, 3;
1, 0, 5;
0, 3, 0, 7;
1, 0, 5, 0, 9;
0, 3, 0, 7, 0, 11;
1, 0, 5, 0, 9, 0, 13; ...
CROSSREFS
Cf. A000217.
Sequence in context: A332099 A045406 A143468 * A127627 A154792 A185911
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Sep 21 2007
EXTENSIONS
Corrected and extended by Philippe Deléham, Oct 28 2011
STATUS
approved