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A277134
Number of "unbordered" n X n binary arrays.
0
1, 2, 14, 496, 64902, 33480816, 68683762160, 562879053495808, 18446172258948389894, 2417833047807055774900336, 1267648177654223684013845739628, 2658454721440933587372867150275542528
OFFSET
0,2
COMMENTS
An n X n array is bordered if there exists some i,j, with 1 <= i, j < n, such that the first i rows are the same as the last i rows, and the first j columns are the same as the last j columns. Otherwise it is unbordered.
EXAMPLE
For n = 2 the only bordered arrays are the arrays of all 0's and all 1's.
CROSSREFS
This is one possible 2-dimensional analog of A003000.
Sequence in context: A365269 A271145 A357508 * A009997 A328377 A048137
KEYWORD
nonn
AUTHOR
Jeffrey Shallit, Oct 01 2016
STATUS
approved