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A326928
The number of n X n symmetric real (0,1) matrices whose eigenvalues are all integers.
1
1, 2, 6, 28, 154, 1174, 11480
OFFSET
0,2
CROSSREFS
Cf. A003024.
Sequence in context: A305199 A295792 A004984 * A277381 A184695 A086633
KEYWORD
nonn,more,changed
AUTHOR
Tingyu Tao, Oct 22 2019
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Oct 20 2024
STATUS
approved