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Search: id:A140408
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| A140408 |
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A simple recurrences family.Triangle rows: n -1's followed by n+1 (n+1)'s.On line.First cases: a(n)=a(n-1); a(n)=-a(n-1)+2a(n-2)+2a(n-3), today 1, 2, 3, 3, 7, 5, 15, 9 ; a(n)=-a(n-1)-a(n-2)+3a(n-3)+3a(n-4)+3a(n-5), A140298,A140313, not mentionned in them; a(n)=-a(n-1)-a(n-2)-a(n-3)+4a(n-4)+4a(n-5)+4a(n-6)+4a(n-7) , Jun 2 2008 submitted -1, -1, -1, 4, 4, 4, 4, -8 ;. |
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| 1, -1, 2, 2, -1, -1, 3, 3, 3, -1, -1, -1, 4, 4, 4, 4, -1, -1, -1, -1, 5, 5, 5, 5, 5, -1, -1, -1, -1, -1, 6, 6, 6, 6, 6, 6, -1, -1, -1, -1, -1, -1, 7, 7, 7, 7, 7, 7, 7, -1, -1, -1, -1, -1, -1, -1, 8, 8, 8, 8, 8, 8, 8, 8, -1, -1, -1, -1, -1, -1, -1, -1, 9, 9, 9, 9, 9, 9, 9, 9, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
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