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A145006
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Triangle read by rows, generator for the partition numbers, A000041
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4
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1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, -1, 0, 0, 1, 1, 0, 0, -1, 0, 0, 1, 1, 0, -1, 0, -1, 0, 0, 1, 1, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0
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OFFSET
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0,1
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COMMENTS
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The partition numbers, A000041, = eigenvector of the triangle. With A080995, characteristic function of the generalized pentagonal numbers, we apply signs: (++ -- ++,...) to the 1's, starting with offset 1. This gives an opposite parity to Euler's partition formula which is (with offset 1): -p(n-1) - p(n-2) + p(n-5) + p(n-7),...
By applying termwise products of A000041 terms and row terms of A145006, we obtain the eigentriangle of the partition numbers.
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LINKS
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Table of n, a(n) for n=0..77.
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FORMULA
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Triangle by columns: let A = an infinite lower triangular matrix with the characteristic function of A001318: (1, 2, 5, 7, 12, 15,...) in every column; signed: (++ -- ++,...).
Shift triangle A down one place and insert "1" in the T(0,0) position, giving triangle A145006. The eigenvector of the triangle = A000041, the partition numbers: (1, 1, 2, 3, 5, 7, 11,...). Lim_{n=1..inf} A145006^n = A000041. Or, simply take a suitably large power of the triangle, which quickly converges to A000041 as a vector.
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EXAMPLE
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First few rows of the triangle =
1;
1, 0;
1, 1, 0;
0, 1, 1, 0;
0, 0, 1, 1, 0;
-1, 0, 0, 1, 1, 0;
0, -1, 0, 0, 1, 1, 0;
-1, 0, -1, 0, 0, 1, 1, 0;
0, -1, 0, -1, 0, 0, 1, 1, 0;
0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
0, 1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
0, 0, 1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
1, 0, 0, 1, 0, 0, 0, 0, -1, 0, -1, 0, 0, 1, 1, 0;
...
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CROSSREFS
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A000041, Cf. A080995, A001318, A145007
Sequence in context: A086747 A141727 A123594 * A080813 A100672 A079559
Adjacent sequences: A145003 A145004 A145005 * A145007 A145008 A145009
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KEYWORD
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eigen,tabl,sign
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AUTHOR
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Gary W. Adamson, Sep 28 2008
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STATUS
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approved
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