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A057981
Number of singular n X n (-1,0,1)-matrices.
4
0, 1, 33, 7875, 15099201, 237634987683, 30805715676309201
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..6.
Eric Weisstein's World of Mathematics,
Singular Matrix.
Minfeng Wang,
C++ program to calculate A057981
FORMULA
a(n) =
A060722
(n) -
A056989
(n). -
Alois P. Heinz
, Dec 02 2019
CROSSREFS
Complement of
A056989
.
Cf.
A060722
,
A330134
.
Sequence in context:
A330134
A210069
A316777
*
A219563
A183237
A099828
Adjacent sequences:
A057978
A057979
A057980
*
A057982
A057983
A057984
KEYWORD
nonn
,
more
AUTHOR
Eric W. Weisstein
, Oct 23 2000
EXTENSIONS
a(5) from
Giovanni Resta
, Feb 20 2009
a(0)=0 prepended by
Alois P. Heinz
, Dec 02 2019
a(0)-a(5) confirmed and a(6) added by
Minfeng Wang
, May 01 2024
STATUS
approved
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Last modified August 19 20:56 EDT 2024. Contains 375310 sequences. (Running on oeis4.)