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A171808 Number of 5 X 5 permutation matrices such that the n-th matrix power is the identity matrix and the determinant is +1. 4
1, 15, 20, 0, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Sum of this sequence is equal to the number of permutation matrices with determinant +1 = 5!/2 = 60. For number matrices with determinant = -1 see A171809.

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

a(1)=1 because there is only one matrix whose first power is the identity matrix (this is the identity matrix itself).

CROSSREFS

Cf. A171806, A171809.

Sequence in context: A031112 A219394 A330522 * A134617 A113529 A214410

Adjacent sequences:  A171805 A171806 A171807 * A171809 A171810 A171811

KEYWORD

fini,nonn,full

AUTHOR

Artur Jasinski, Dec 18 2009

STATUS

approved

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Last modified May 31 07:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)