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A118987
Number of different values taken by the determinant of a symmetric real (+1,-1)-matrix of order n.
4
1, 2, 2, 3, 5, 7, 11, 19, 40, 91, 214
OFFSET
0,2
CROSSREFS
Cf. A006125 (number of symmetric real (+1,-1)-matrices of order (n-1)).
Sequence in context: A147997 A218557 A060699 * A284909 A062724 A126024
KEYWORD
nonn,more
AUTHOR
Giovanni Resta, May 08 2006
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Mar 16 2019
a(8) from Minfeng Wang, Jun 10 2024
a(9)-a(10) from Minfeng Wang, Jun 12 2024
STATUS
approved