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Search: id:A131925
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| 1, 5, 3, 5, 7, 5, 9, 7, 9, 7, 9, 11, 9, 11, 9, 13, 11, 13, 11, 13, 11, 13, 15, 13, 15, 13, 15, 13, 17, 15, 17, 15, 17, 15, 17, 15, 17, 19, 17, 19, 17, 19, 17, 19, 17
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums = A077221: (1, 8, 17, 32, 49, 72, 97,...).
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FORMULA
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2*A002024 - A000012(signed + - + -,... by columns). A002024 = (1; 2,2; 3,3,3;...); A000012(signed) = (1; -1,1; 1,-1,1;...).
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EXAMPLE
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First few rows of the triangle are:
1;
5, 3;
5, 7, 5;
9, 7, 9, 7;
9, 11, 9, 11, 9;
13, 11, 13, 11, 13, 11;
13, 15, 13, 15, 13, 15, 13;
....
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CROSSREFS
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Cf. A002024, A000012, A077221.
Sequence in context: A165098 A073316 A092516 this_sequence A128010 A114740 A128008
Adjacent sequences: A131922 A131923 A131924 this_sequence A131926 A131927 A131928
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 29 2007
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