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A113128
A simple 4-diagonal matrix based on (1+x)^3.
1
1, 3, 2, 3, 6, 3, 1, 6, 9, 4, 0, 2, 9, 12, 5, 0, 0, 3, 12, 15, 6, 0, 0, 0, 4, 15, 18, 7, 0, 0, 0, 0, 5, 18, 21, 8, 0, 0, 0, 0, 0, 6, 21, 24, 9, 0, 0, 0, 0, 0, 0, 7, 24, 27, 10, 0, 0, 0, 0, 0, 0, 0, 8, 27, 30, 11, 0, 0, 0, 0, 0, 0, 0, 0, 9, 30, 33, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 33, 36, 13, 0, 0, 0, 0
OFFSET
0,2
COMMENTS
Row sums are A086570. Diagonal sums are the odd numbers A005408.
FORMULA
Number triangle where column k has g.f. (1+x)^3*(k+1)x^k.
EXAMPLE
Triangle begins
1;
3, 2;
3, 6, 3;
1, 6, 9, 4;
0, 2, 9, 12, 5;
0, 0, 3, 12, 15, 6;
0, 0, 0, 4, 15, 18, 7;
0, 0, 0, 0, 5, 18, 21, 8;
CROSSREFS
Sequence in context: A343368 A021313 A240162 * A220075 A266593 A130459
KEYWORD
easy,nonn,tabl
AUTHOR
Paul Barry, Oct 14 2005
STATUS
approved