216288

Appears in sequences

• Number of complementary pairs of circulant graphs on n nodes.at n=43A054929
• The number of permutations of {1,2,...,n,1,2,...,n} with the property that there are k numbers between the two k's in the set for k=1,...,n.at n=11A176127
• The number of permutations of {1,2,...,n,1,2,...,n} with the property that there are k numbers between the two k's in the set for k=1,...,n, as n runs through the positive integers congruent to -1 or 0 mod 4.at n=5A268536