The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A071900

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A071900

1/4 times the number of n X n 0..7 matrices with MM' mod 8 = I, where M' is the transpose of M and I is the n X n identity matrix.
(history; published version)

#22 by Michael De Vlieger at Tue Nov 08 11:07:34 EST 2022

STATUS

proposed

approved

#21 by Michel Marcus at Tue Nov 08 10:18:11 EST 2022

STATUS

editing

proposed

#20 by Michel Marcus at Tue Nov 08 10:17:46 EST 2022

FORMULA

ConjectyreConjecture: a(n) = 2^(n*(n-1)/2) * A071303(n) for n >= 1. - Michel Marcus, Nov 08 2022

#19 by Michel Marcus at Tue Nov 08 10:15:57 EST 2022

FORMULA

Conjectyre: a(n) = 2^(n*(n-1)/2) * A071303(n) for n >= 1. - Michel Marcus, Nov 08 2022

CROSSREFS

Cf. A060968, A071302, A071303, A071304, A071305, A071306, A071307, A071308, A071309, A071310, A071900, A087784, A208895, A264083.

STATUS

approved

editing

#18 by Bruno Berselli at Thu Dec 19 05:54:30 EST 2019

STATUS

proposed

approved

#17 by Michel Marcus at Thu Dec 19 01:38:59 EST 2019

STATUS

editing

proposed

#16 by Michel Marcus at Thu Dec 19 01:38:56 EST 2019

KEYWORD

nonn,more,changed

STATUS

proposed

editing

#15 by Petros Hadjicostas at Wed Dec 18 22:06:56 EST 2019

STATUS

editing

proposed

#14 by Petros Hadjicostas at Wed Dec 18 22:05:59 EST 2019

EXAMPLE

Note that for n = 3 we have 4*a(3) = 4*1536 = 6144 = A264083(78). (End)

#13 by Petros Hadjicostas at Wed Dec 18 22:05:31 EST 2019

EXAMPLE

All four classes of matrices have the same number of elements, that is, 16 each. (End)

Note that for n = 3 we have 4*a(3) = 4*1536 = 6144 = A264083(7). (End)

STATUS

proposed

editing