A277748 Number of n X n QR matrices.

1, 4, 40, 768, 27648, 1900544, 253755392

Offset

1,2

Links

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

D. S. Dummit, E. P. Dummit, H. Kisilevsky, Characterizations of quadratic, cubic, and quartic residue matrices, arXiv preprint arXiv:1512.06480 [math.NT], 2015.

Crossrefs

Cf. A277746.

Sequence in context: A064422 A258662 A140701 * A278590 A370086 A087047

Adjacent sequences: A277745 A277746 A277747 * A277749 A277750 A277751

Keyword

nonn,more

Author

N. J. A. Sloane, Nov 08 2016

Status

approved