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A055136
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Triangle: a(n,k) = A055135(n,k)/C(n,k).
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2
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1, 0, 1, -1, -1, 1, -2, 0, -2, 1, -3, 0, 3, -3, 1, -4, 0, -4, 8, -4, 1, -5, 0, 5, -20, 15, -5, 1, -6, 0, -6, 48, -54, 24, -6, 1, -7, 0, 7, -112, 189, -112, 35, -7, 1, -8, 0, -8, 256, -648, 512, -200, 48, -8, 1, -9, 0, 9, -576, 2187, -2304, 1125, -324, 63, -9, 1, -10, 0
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,7
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FORMULA
| n, k>1: a(n, k) = (-1)^(n+k)*(n-1)*(k-1)^(n-k-1).
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EXAMPLE
| 1; 0,1; -1,-1,1; -2,0,-2,1; -3,0,3,-3,1; ...
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CROSSREFS
| Sequence in context: A127185 A159780 A138036 * A074397 A082023 A078152
Adjacent sequences: A055133 A055134 A055135 * A055137 A055138 A055139
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KEYWORD
| sign,tabl
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Apr 25 2000
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