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A131950
A002024 + A131821 + A007318 - 2*A000012 as infinite lower triangular matrices.
1
1, 3, 3, 5, 4, 5, 7, 6, 6, 7, 9, 8, 10, 8, 9, 11, 10, 15, 15, 10, 11, 13, 12, 21, 26, 21, 12, 13, 15, 14, 28, 42, 42, 28, 14, 15, 17, 16, 36, 64, 78, 64, 36, 16, 17, 19, 18, 45, 93, 135, 135, 93, 45, 18, 19
OFFSET
0,2
COMMENTS
Row sums = A131951: (1, 6, 14, 26, 44, 72, ...).
EXAMPLE
First few rows of the triangle:
1;
3, 3;
5, 4, 5;
7, 6, 6, 7;
9, 8, 10, 8, 9;
11, 10, 15, 15, 10, 11;
13, 12, 21, 26, 21, 12, 13;
15, 14, 28, 42, 42, 28, 14, 15;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 30 2007
STATUS
approved