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A086889 Real part of Propp's cubic recurrence starting with i (i^2=-1). 1
0, 0, 0, 0, -1, 1, -3, -3, -41, 140, -93456, 280356252, -471833669834248, 40261350925439315783335171, 20143180524957577201436416071451979623101429, 9048277144756224572757714728840507662214586396123974675011643142128755383165 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
COMMENTS
b(n)=x(n)+i*y(n) where x(n) and y(n) are integer sequences.
LINKS
FORMULA
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)
CROSSREFS
Sequence in context: A218863 A082394 A308645 * A368162 A269909 A231989
KEYWORD
sign
AUTHOR
Benoit Cloitre, Sep 17 2003
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)