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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Cf. A087983, A118987, A118986.

Sequence in context: A300353 A049868 A120363 * A049904 A049906 A014265

Adjacent sequences:  A118985 A118986 A118987 * A118989 A118990 A118991

KEYWORD

nonn,more

AUTHOR

Giovanni Resta, May 08 2006

STATUS

approved

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Last modified September 15 18:22 EDT 2019. Contains 327082 sequences. (Running on oeis4.)