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A177991
Triangle read by rows, A070909 * A177990
3
1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1
OFFSET
0,8
COMMENTS
Row sums = A117142: (1, 2, 3, 5, 6, 9,...)
FORMULA
As infinite lower triangular matrices, A070909 * A177990
EXAMPLE
First few rows of the triangle =
1;
1, 1;
1, 1, 1;
1, 2, 1, 1;
1, 2, 1, 1, 1;
1, 3, 1, 2, 1, 1;
1, 3, 1, 2, 1, 1, 1;
1, 4, 1, 3, 1, 2, 1, 1;
1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1;
1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, May 16 2010
EXTENSIONS
a(28)=1 inserted before the first "4" by Georg Fischer, Dec 28 2021
STATUS
approved