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A188895 Number of n X n (real) {-1,1}-matrices having determinant A003433(n). 3
1, 4, 96, 384, 30720, 7372800, 4335206400, 2477260800, 25684239974400, 7191587192832000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Hadamard's Maximum Determinant Problem
Eric Weisstein's World of Mathematics, (-1, 1)-Matrix
FORMULA
a(n) = 2^(2n+1) * A051752(n) for n>=2. - Hugo Pfoertner and Minfeng Wang, Jan 22 2023
CROSSREFS
Sequence in context: A220682 A210926 A302121 * A068114 A272109 A203316
KEYWORD
nonn,more,hard
AUTHOR
Eric W. Weisstein, Apr 19 2011
EXTENSIONS
Offset changed to 0 by Hugo Pfoertner, Jan 23 2023
a(5)-a(9) from Minfeng Wang, Jan 22 2023
STATUS
approved

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Last modified June 19 13:19 EDT 2024. Contains 373503 sequences. (Running on oeis4.)