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A277748
Number of n X n QR matrices.
1
1, 4, 40, 768, 27648, 1900544, 253755392
OFFSET
1,2
LINKS
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
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 08 2016
STATUS
approved