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Search: id:A120111
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| 1, -2, 1, 0, -3, 1, 0, 0, -2, 1, 0, 0, 0, -5, 1, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, -7, 1, 0, 0, 0, 0, 0, 0, -2, 1, 0, 0, 0, 0, 0, 0, 0, -3, 1, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -11, 1
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Sub-diagonal is -lcm(1,...,n+2)/lcm(1,...,n+1) or -A014963(n+1). Row sums are A120112.
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EXAMPLE
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Triangle begins
1,
-2, 1,
0, -3, 1,
0, 0, -2, 1,
0, 0, 0, -5, 1,
0, 0, 0, 0, -1, 1,
0, 0, 0, 0, 0, -7, 1,
0, 0, 0, 0, 0, 0, -2, 1,
0, 0, 0, 0, 0, 0, 0, -3, 1,
0, 0, 0, 0, 0, 0, 0, 0, -1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, -11, 1
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CROSSREFS
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Sequence in context: A004172 A082754 A063173 this_sequence A130055 A127013 A117362
Adjacent sequences: A120108 A120109 A120110 this_sequence A120112 A120113 A120114
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KEYWORD
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easy,sign,tabl
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jun 09 2006
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