A140836 Number of inequivalent SQ matrices (strongly quadrangular) of order n.

1, 2, 4, 15, 80

Offset

1,2

Links

Table of n, a(n) for n=1..5.

Simone Severini and Ferenc Szollosi, A further look into combinatorial orthogonality, arXiv:0709.3651 [math.CO], 2007-2008. See p. 7.

Crossrefs

Cf. A140837, A140838, A140839, A140860.

Sequence in context: A290024 A292757 A182449 * A020134 A307085 A228934

Adjacent sequences: A140833 A140834 A140835 * A140837 A140838 A140839

Keyword

nonn,more

Author

Jonathan Vos Post, Jul 18 2008

Status

approved