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A231068 Number of black square subarrays of (n+1)X(4+1) binary arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with upper left element zero 1
3, 11, 24, 89, 191, 748, 1573, 6259, 13176, 52497, 110739, 441340, 931361, 3713195, 7836336, 31247585, 65947255, 262980516, 555025545, 2213339483, 4671332880, 18628563209, 39316357723, 156788159916, 330908274229, 1319617809715 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A231070
LINKS
FORMULA
Empirical: a(n) = 14*a(n-2) -61*a(n-4) +148*a(n-6) -289*a(n-8) +325*a(n-10) -227*a(n-12) +95*a(n-14) -28*a(n-16) +4*a(n-18)
EXAMPLE
Some solutions for n=4
..x..0..x..1..x....x..0..x..1..x....x..0..x..0..x....x..0..x..0..x
..1..x..0..x..1....1..x..0..x..0....1..x..1..x..0....0..x..1..x..0
..x..1..x..0..x....x..1..x..1..x....x..0..x..1..x....x..1..x..1..x
..0..x..1..x..1....1..x..0..x..0....0..x..0..x..0....0..x..0..x..1
..x..1..x..0..x....x..0..x..1..x....x..1..x..1..x....x..1..x..0..x
CROSSREFS
Sequence in context: A294415 A141595 A112051 * A185258 A118436 A293413
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 03 2013
STATUS
approved

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Last modified June 23 06:39 EDT 2024. Contains 373629 sequences. (Running on oeis4.)