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A131432 Triangle read by rows: (A000012 * A131431) + (A131431 * A000012) - A000012 as infinite lower triangular matrices. 2
1, 4, 7, 7, 10, 13, 10, 13, 16, 19, 13, 16, 19, 22, 25, 16, 19, 22, 25, 28, 31, 19, 22, 25, 28, 31, 34, 37, 22, 25, 28, 31, 34, 37, 40, 43, 25, 28, 31, 34, 37, 40, 43, 46, 49, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Left border = A016777, (1, 4, 7, 10, 13, ...).
Right border = A016921: (1, 7, 13, 19, 25, ...).
Row sums = A051682, 11-gonal numbers: (1, 11, 30, 58, 95, ...).
LINKS
EXAMPLE
First few rows of the triangle:
1;
4, 7;
7, 10, 13;
10, 13, 16, 19;
13, 16, 19, 22, 25;
16, 19, 22, 25, 28, 31;
19, 22, 25, 28, 31, 34, 37;
...
CROSSREFS
Sequence in context: A159919 A310929 A310930 * A088744 A168074 A061891
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jul 10 2007
EXTENSIONS
a(28) ff. corrected and more terms from Georg Fischer, Jun 05 2023
STATUS
approved

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Last modified April 20 22:14 EDT 2024. Contains 371848 sequences. (Running on oeis4.)