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Search: id:A107865
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| 1, -1, 1, -1, -2, 1, -7, -4, -3, 1, -77, -26, -9, -4, 1, -1145, -287, -67, -16, -5, 1, -21410, -4412, -798, -139, -25, -6, 1, -481683, -86004, -13029, -1830, -251, -36, -7, 1, -12655196, -2017658, -268368, -32191, -3667, -412, -49, -8, 1, -379998938, -55134458, -6630228, -705680, -69868, -6657, -631
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Matrix product with A107867 equals A107876.
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EXAMPLE
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Triangle begins:
1;
-1,1;
-1,-2,1;
-7,-4,-3,1;
-77,-26,-9,-4,1;
-1145,-287,-67,-16,-5,1;
-21410,-4412,-798,-139,-25,-6,1;
-481683,-86004,-13029,-1830,-251,-36,-7,1; ...
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PROGRAM
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(PARI) {T(n, k)=(matrix(n+1, n+1, r, c, if(r>=c, binomial((r-1)*(r-2)/2-(c-1)*(c-2)/2+r-c, r-c)))^-1)[n+1, k+1]}
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CROSSREFS
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Cf. A107862, A107866 (column 0), A107867, A107870, A107876.
Sequence in context: A011274 A122843 A167196 this_sequence A089225 A075085 A124048
Adjacent sequences: A107862 A107863 A107864 this_sequence A107866 A107867 A107868
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KEYWORD
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sign,tabl
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Jun 04 2005
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