|
|
A133791
|
|
Number of n X n binary matrices with every 1 adjacent to some 0 horizontally, vertically, diagonally or antidiagonally.
|
|
9
|
|
|
1, 15, 417, 50625, 24879489, 48231228511, 373654052856545, 11546079143118274625, 1422756868491071266637985, 699232611373976058162941025423, 1370556061582419558173913152072112161, 10714096395475651010921722651799661109404545
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Number of dominating sets in the n X n king graph. - Andrew Howroyd, May 10 2017
|
|
LINKS
|
|
|
MATHEMATICA
|
A218663 = Import["https://oeis.org/A218663/b218663.txt", "Table"][[All, 2]];
a[n_] := A218663[[2 n^2 - 2 n + 1]];
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|