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A134390
Duplicate of A131416.
0
1, 4, 3, 8, 8, 5, 13, 14, 12, 7, 19, 21, 20, 16, 9, 26, 29, 29, 26, 20, 11, 34, 38, 39, 37, 32, 24, 13, 43, 48, 50, 49, 45, 38, 28, 15, 53, 59, 62, 62, 59, 53, 44, 32, 17, 64, 71, 75, 76, 74, 69, 61, 50, 36, 19, 76, 84, 89, 91, 90, 86, 79, 69, 56, 40, 21, 89, 98, 104, 107, 107, 104, 98, 89, 77, 62, 44, 23
OFFSET
1,2
COMMENTS
Row sums = A127736: (1, 7, 21, 46, 85, 141, 217, ...).
FORMULA
(A000012 * A002260 + A002260 * A000012) - A000012 as infinite lower triangular matrices; where A000012 = (1; 1,1; 1,1,1; ...) and A002260 = (1; 1,2; 1,2,3; ...).
EXAMPLE
First few rows of the triangle:
1;
4, 3;
8, 8, 5;
13, 14, 12, 7;
19, 21, 20, 16, 9;
26, 29, 29, 26, 20, 11;
...
CROSSREFS
Sequence in context: A196521 A021699 A131416 * A004125 A137924 A171527
KEYWORD
dead
AUTHOR
Gary W. Adamson, Oct 23 2007
EXTENSIONS
a(6) corrected and more terms from Georg Fischer, Jun 05 2023
STATUS
approved