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A253704 Number of (7+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically 1
4456, 2416, 2982, 3136, 4180, 5030, 6558, 8846, 12620, 17170, 22264, 27490, 36614, 48914, 70968, 96312, 131294, 168514, 223910, 300006, 420174, 580192, 795556, 1051418, 1403720, 1862978, 2573560, 3507284, 4848850, 6469278, 8721932 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A253698

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +a(n-5) -a(n-6) +2*a(n-7) +a(n-8) -8*a(n-9) -a(n-10) +2*a(n-11) +5*a(n-13) -11*a(n-15) +6*a(n-17) +6*a(n-19) -8*a(n-21) +a(n-23) +4*a(n-25) for n>37

EXAMPLE

Some solutions for n=4

..1..1..0..0..1....0..1..1..0..0....1..0..0..1..1....1..1..1..1..0

..0..1..0..0..1....1..0..0..1..0....0..1..1..0..1....0..1..0..1..1

..0..0..1..1..0....1..0..0..1..1....1..0..1..0..0....0..1..1..0..0

..1..1..0..1..1....0..1..1..0..0....1..0..0..1..1....1..0..0..1..0

..0..1..1..0..0....1..0..1..0..0....0..1..1..0..1....0..1..0..0..1

..1..0..0..1..0....1..0..0..1..1....1..0..1..0..1....0..0..1..1..0

..0..1..0..1..0....0..1..1..0..1....1..0..1..1..0....1..1..0..1..1

..1..1..0..0..1....0..1..1..0..1....1..1..0..0..1....1..1..0..1..0

CROSSREFS

Sequence in context: A184611 A279042 A253697 * A235015 A185767 A089202

Adjacent sequences:  A253701 A253702 A253703 * A253705 A253706 A253707

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2015

STATUS

approved

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Last modified May 18 18:42 EDT 2022. Contains 353824 sequences. (Running on oeis4.)