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A096904 A card-arranging problem: number of permutations p_1, ..., p_n of 1, ..., n such that i + p_i is a cube for every i. 1
0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 4, 0, 0, 4, 4, 5, 1, 2, 1, 1, 1, 1, 2, 3, 7, 3, 10, 6, 5, 1, 1, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 3, 30, 37, 1963, 1289, 1560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,112

LINKS

Table of n, a(n) for n=1..180.

FORMULA

a(n) = permanent(m), where the n X n matrix m is defined by m(i,j) = 1 or 0, depending on whether i+j is a cube or not.

CROSSREFS

Cf. A006063, A096680.

Sequence in context: A203542 A204301 A204084 * A096406 A189885 A151673

Adjacent sequences:  A096901 A096902 A096903 * A096905 A096906 A096907

KEYWORD

nonn

AUTHOR

Ray Chandler, Aug 01 2004

STATUS

approved

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Last modified February 21 06:25 EST 2018. Contains 299390 sequences. (Running on oeis4.)