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A135152
A004736 + A128174 - I, I = Identity matrix.
2
1, 2, 1, 4, 2, 1, 4, 4, 2, 1, 6, 4, 4, 2, 1, 6, 6, 4, 4, 2, 1, 8, 6, 6, 4, 4, 2, 1, 8, 8, 6, 6, 4, 4, 2, 1, 10, 8, 8, 6, 6, 4, 4, 2, 1, 10, 10, 8, 8, 6, 6, 4, 4, 2, 1
OFFSET
1,2
COMMENTS
Row sums = A047838: (1, 3, 7, 11, 17, 23, 31, 39, ...). The triangle is a companion to A135151.
FORMULA
A004736 + A128174 - I, where I = Identity matrix, A004736 = (1; 2,1; 3,2,1; ...) and A128174 = (1; 0,1; 1,0,1; 0,1,0,1; ...).
EXAMPLE
First few rows of the triangle:
1;
2, 1;
4, 2, 1;
4, 4, 2, 1;
6, 4, 4, 2, 1;
6, 6, 4, 4, 2, 1;
8, 6, 6, 4, 4, 2, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Nov 21 2007
STATUS
approved