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Search: id:A047991
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| A047991 |
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Triangle formed from expansion of (x-1)(x+2)(x-3)...(x+-n). |
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+0
2
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| 1, 1, -1, 1, 1, -2, 1, -2, -5, 6, 1, 2, -13, -14, 24, 1, -3, -23, 51, 94, -120, 1, 3, -41, -87, 400, 444, -720, 1, -4, -62, 200, 1009, -2356, -3828, 5040, 1, 4, -94, -296, 2609, 5716, -22676, -25584, 40320, 1, -5, -130, 550, 5273, -17765, -74120, 178500, 270576, -362880
(list; table; graph; listen)
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OFFSET
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0,6
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REFERENCES
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Studied by M. Bhargava (bhargava(AT)math.Princeton.EDU) and H. S. Wilf.
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LINKS
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T. D. Noe, Rows n=0..100 of triangle, flattened
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EXAMPLE
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1; 1,-1; 1,1,-2; 1,-2,-5,6; ...
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CROSSREFS
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A047990 gives sums of absolute values of rows.
Sequence in context: A098509 A019910 A084309 this_sequence A120898 A052532 A006704
Adjacent sequences: A047988 A047989 A047990 this_sequence A047992 A047993 A047994
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KEYWORD
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sign,tabl,easy,nice
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AUTHOR
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njas
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