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A131247
1
1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 1, 7, 7, 3, 1, 1, 9, 13, 7, 3, 1, 1, 11, 21, 15, 7, 3, 1, 1, 13, 31, 29, 15, 7, 3, 1, 1, 15, 43, 51, 31, 15, 7, 3, 1, 1, 17, 57, 83, 61, 31, 15, 7, 3, 1
OFFSET
0,5
COMMENTS
Row sums = A104161 starting (1, 2, 5, 10, 19, 34, 59, ...). Reversal, A131248 is generated from 2*A004070 - A000012.
FORMULA
2*A052509 - A000012, where A000012 = (1; 1,1; 1,1,1; ...).
EXAMPLE
First few rows of the triangle:
1;
1, 1;
1, 3, 1;
1, 5, 3, 1;
1, 7, 7, 3, 1;
1, 9, 13, 7, 3, 1;
1, 11, 21, 15, 7, 3, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jun 23 2007
STATUS
approved