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A209592 Number of n X n 0..7 arrays with every element equal to a diagonal or antidiagonal reflection 1
8, 4096, 3932160, 241591910400, 27831388078080000, 205195258022068224000000, 2836619246897071128576000000000, 2509659166022727122011815936000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A209593
LINKS
FORMULA
a(n) = 8 ^ (2*n-(n modulo 2)) * 120 ^ ((n*n-2*n+(n modulo 2))/4)
EXAMPLE
Some solutions for n=3
..0..3..3....0..2..7....0..3..7....0..4..0....0..7..7....0..7..5....0..4..0
..3..2..7....2..5..5....3..5..3....6..7..4....7..1..2....4..6..7....1..0..4
..4..7..0....7..5..0....3..3..0....6..6..0....7..2..0....5..4..0....1..1..0
CROSSREFS
Sequence in context: A024113 A167059 A013742 * A060760 A203436 A159368
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved

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Last modified March 19 01:57 EDT 2024. Contains 370952 sequences. (Running on oeis4.)