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A135858
1
1, 3, 1, 7, 5, 1, 13, 13, 7, 1, 21, 21, 21, 9, 1, 31, 31, 31, 31, 11, 1, 43, 43, 43, 43, 43, 13, 1, 57, 57, 57, 57, 57, 57, 15, 1, 73, 73, 73, 73, 73, 73, 73, 17, 1, 91, 91, 91, 91, 91, 91, 91, 91, 19, 1
OFFSET
1,2
COMMENTS
Row sums = A135859: (1, 4, 13, 34, 73, 136, ...).
FORMULA
A128229^2 * A000012, where A128229 = a bidiagonal matrix with all 1's in the main diagonal and (1, 2, 3, ...) in the subdiagonal.
EXAMPLE
First few rows of the triangle:
1;
3, 1;
7, 5, 1;
13, 13, 7, 1;
21, 21, 21, 9, 1;
31, 31, 31, 31, 11, 1;
43, 43, 43, 43, 43, 13, 1;
...
CROSSREFS
Sequence in context: A271258 A100584 A185877 * A193845 A372938 A265706
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Dec 01 2007
STATUS
approved