A119009 Number of n X n real symmetric (0,1)-matrices with permanent = 1.

1, 4, 22, 286, 5126, 190096, 9477868, 923926396, 118222774300

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A089482, A118986, A118989, A118991, A119008.

Sequence in context: A195227 A265908 A359111 * A326883 A317803 A053722

Adjacent sequences: A119006 A119007 A119008 * A119010 A119011 A119012

Keyword

nonn,more

Author

Giovanni Resta, May 08 2006

Extensions

a(8)-a(9) from Max Alekseyev, Jun 18 2025

Status

approved