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A134249
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Triangle read by rows, taken from the lower triangular matrix (M * A000012 + A000012 * M) - A000012; where M = lower triangular matrix with (1,1,1,...) in the main diagonal and the triangular numbers in the subdiagonal and A000012 = (1; 1,1; 1,1,1;...).
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2
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1, 3, 1, 5, 7, 1, 8, 10, 13, 1, 12, 14, 17, 21, 1, 17, 19, 22, 26, 31, 1, 23, 25, 28, 32, 37, 43, 1, 30, 32, 35, 39, 44, 50, 57, 1, 38, 40, 43, 47, 52, 58, 65, 73, 1, 47, 49, 52, 56, 61, 67, 74, 82, 91, 1
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OFFSET
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1,2
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COMMENTS
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Row sums = A037235: (1, 4, 13, 32, 65, 116,...). Left column = A134250: (1, 3, 5, 8, 12, 17, 23,...).
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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, 1;
5, 7, 1;
8, 10, 13, 1;
12, 14, 17, 21, 1;
17, 19, 22, 26, 31, 1;
23, 25, 28, 32, 37, 43, 1;
...
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CROSSREFS
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Cf. A037235, A134250.
Sequence in context: A201552 A216182 A143524 * A188509 A188146 A001607
Adjacent sequences: A134246 A134247 A134248 * A134250 A134251 A134252
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Oct 15 2007
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EXTENSIONS
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Edited by N. J. A. Sloane, Nov 01 2009
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STATUS
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approved
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