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1, 3, 4, 6, 9, 10, 10, 16, 19, 20, 15, 25, 31, 34, 35, 21, 36, 46, 52, 55, 56, 28, 49, 64, 74, 80, 83, 84, 36, 64, 85, 100, 110, 116, 119, 120, 45, 81, 109, 130, 145, 155, 161, 164, 165, 55, 100, 136, 164, 185, 200, 210, 216, 219, 220
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Row sums = A001296 starting (1, 7, 25, 65, 140,...).
Right border = tetrahedral numbers, left border = triangular numbers.
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LINKS
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Table of n, a(n) for n=1..55.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 4;
6, 9, 10;
10, 16, 19, 20;
15, 25, 31, 34, 35;
21, 36, 46, 52, 55, 56;
28, 49, 64, 74, 80, 83, 84;
36, 64, 85, 100, 110, 116, 119, 120;
...
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CROSSREFS
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Cf. A001290.
Sequence in context: A186700 A028987 A186709 * A225059 A190899 A173671
Adjacent sequences: A143034 A143035 A143036 * A143038 A143039 A143040
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KEYWORD
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nonn,tabl,changed
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AUTHOR
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Gary W. Adamson & Roger L. Bagula, Jul 18 2008
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STATUS
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approved
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