A118988 Number of different values taken by the permanent of a symmetric real (+1,-1)-matrix of order n.

1, 2, 2, 4, 7, 15, 20, 62, 190, 771

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Minfeng Wang, C++ program.

Crossrefs

Cf. A087983, A118987, A118986.

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

Sequence in context: A300353 A049868 A120363 * A049904 A049906 A014265

Adjacent sequences: A118985 A118986 A118987 * A118989 A118990 A118991

Keyword

nonn,more,changed

Author

Giovanni Resta, May 08 2006

Extensions

a(8)-a(9) from Minfeng Wang, Jun 20 2024

a(0)=1 prepended by Alois P. Heinz, Jun 21 2024

Status

approved