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A335776
Number of idempotent non-symmetric n X n (0,1)-matrices over the reals.
0
0, 0, 4, 42, 436, 5650, 96544, 2185610, 65108236
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OFFSET
0,3
COMMENTS
Off diagonal entries of an idempotent symmetric n X n (0,1)-matrix must be zero.
LINKS
Table of n, a(n) for n=0..8.
FORMULA
a(n) =
A086922
(n) -
A000079
(n).
EXAMPLE
a(2) = 4 because [1,1] [0,1] [0,0] [1,0]
[0,0], [0,1], [1,1], [1,0], are non-symmetric and idemponent.
CROSSREFS
Cf.
A000079
,
A086922
.
Sequence in context:
A085954
A046719
A366819
*
A092800
A370282
A268542
Adjacent sequences:
A335773
A335774
A335775
*
A335777
A335778
A335779
KEYWORD
nonn
,
more
AUTHOR
Torlach Rush
, Jun 22 2020
STATUS
approved
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Last modified July 15 03:33 EDT 2024. Contains 374324 sequences. (Running on oeis4.)