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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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A231065 A231066 A231067 * A231069 A231070 A231071

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 03 2013

STATUS

approved

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)