A118987 - OEIS

%I #17 Jun 22 2024 03:39:51

%S 1,2,2,3,5,7,11,19,40,91,214

%N Number of different values taken by the determinant of a symmetric real (+1,-1)-matrix of order n.

%H Minfeng Wang, <a href="/A118987/a118987.cpp.txt">C++ program to calculate A118987</a>

%Y Cf. A089472, A118988, A118985.

%Y Cf. A006125 (number of symmetric real (+1,-1)-matrices of order (n-1)).

%K nonn,more

%O 0,2

%A _Giovanni Resta_, May 08 2006

%E a(0)=1 prepended by _Alois P. Heinz_, Mar 16 2019

%E a(8) from _Minfeng Wang_, Jun 10 2024

%E a(9)-a(10) from _Minfeng Wang_, Jun 12 2024