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Search: id:A119522
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| A119522 |
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Determinant of n X n matrix of first n^2 nonzero terms of triangular numbers. |
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+0
1
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OFFSET
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1,2
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FORMULA
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a(n) = determinant of n X n matrix of first n^2 nonzero terms of A000217(k) for k>0. a(n) = determinant of n X n matrix of k*(k+1)/2 for k from 1 through n^2.
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EXAMPLE
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a(3) = -27 =
|.1..3..6|
|10.15.21|
|28.36.45|.
a(4) = 0 because of the singular matrix 0 =
|.1...3...6..10|
|15..21..28..36|
|45..55..66..78|
|91.105.120.136|.
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CROSSREFS
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Cf. A000217, A119493.
Adjacent sequences: A119519 A119520 A119521 this_sequence A119523 A119524 A119525
Sequence in context: A129663 A112646 A084825 this_sequence A070494 A070493 A070492
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KEYWORD
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easy,sign
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AUTHOR
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Jonathan Vos Post (jvospost2(AT)yahoo.com), May 27 2006
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