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A131782
Triangle read by rows: (A004736 * A000012) + (A000012 * A004736) - A000012 as infinite lower triangular matrices.
1
1, 5, 1, 11, 5, 1, 19, 11, 5, 1, 29, 19, 11, 5, 1, 41, 29, 19, 11, 5, 1, 55, 41, 29, 19, 11, 5, 1, 71, 55, 41, 29, 19, 11, 5, 1, 89, 71, 55, 41, 29, 19, 11, 5, 1, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1, 131, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1, 155, 131, 109, 89, 71, 55, 41, 29, 19, 11, 5, 1
OFFSET
1,2
COMMENTS
Row sums = A084990 starting (1, 6, 17, 36, 65, 106, ...).
FORMULA
n-th row = n descending terms of A028387: (1, 5, 11, 19, 29, 41, 55, ...). By columns, each column = A028387: (1, 5, 11, 19, 29, ...).
EXAMPLE
First few rows of the triangle:
1;
5, 1;
11, 5, 1;
19, 11, 5, 1;
29, 19, 11, 5, 1;
41, 29, 19, 11, 5, 1;
55, 41, 29, 19, 11, 5, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 14 2007
EXTENSIONS
Sign in definition and a(41) corrected; more terms from Georg Fischer, Jun 05 2023
STATUS
approved