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A057981 Number of singular n X n (-1,0,1)-matrices. 4
0, 1, 33, 7875, 15099201, 237634987683, 30805715676309201 (list; graph; refs; listen; history; text; internal format)
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 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)