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A086889
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Real part of Propp's cubic recurrence starting with i (i^2=-1).
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1
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0, 0, 0, 0, -1, 1, -3, -3, -41, 140, -93456, 280356252, -471833669834248, 40261350925439315783335171, 20143180524957577201436416071451979623101429, 9048277144756224572757714728840507662214586396123974675011643142128755383165
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OFFSET
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1,7
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COMMENTS
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b(n)=x(n)+i*y(n) where x(n) and y(n) are integer sequences.
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LINKS
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FORMULA
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a(n)=Re(b(n)) where b(1)=b(2)=b(3)=b(4)=i and b(n)=(1+b(n-1)*b(n-2)*b(n-3))/b(n-4)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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