A065763 Number of invertible Steinhaus matrices of order n.

1, 0, 4, 3, 10, 12, 76, 122, 278, 596, 1502, 3057, 6758, 13643, 29333, 59454, 121967, 247085, 505007, 1016475, 2049676, 4115006, 8278499

Offset

2,3

Comments

A Steinhaus matrix is the adjacency matrix of the corresponding Steinhaus graph. - Sean A. Irvine, Sep 13 2023

Links

Table of n, a(n) for n=2..24.

Jonathan Chappelon, Regular Steinhaus graphs of odd degree, arXiv:0806.2779 [math.CO], 2008-2009.

W. Dymacek, Steinhaus Graphs - A Description.

Sean A. Irvine, Java program (github).

Crossrefs

Cf. A003660, A003661, A007813.

Sequence in context: A316196 A081617 A103252 * A185730 A205965 A242391

Adjacent sequences: A065760 A065761 A065762 * A065764 A065765 A065766

Keyword

nonn,more

Author

Felix Goldberg (felixg(AT)tx.technion.ac.il), Dec 04 2001

Extensions

More terms from Vladeta Jovovic, Dec 07 2001

a(19)-a(24) from Sean A. Irvine, Sep 13 2023

Status

approved