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A277748 Number of n X n QR matrices. 1
1, 4, 40, 768, 27648, 1900544, 253755392 (list; graph; refs; listen; history; text; internal format)
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 A087047 A211035

Adjacent sequences:  A277745 A277746 A277747 * A277749 A277750 A277751

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 08 2016

STATUS

approved

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Last modified August 3 16:28 EDT 2021. Contains 346439 sequences. (Running on oeis4.)