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A253701 Number of (4+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
264, 304, 480, 700, 992, 1262, 1790, 2538, 4020, 5990, 8836, 12394, 17968, 26012, 38598, 56584, 83518, 120602, 175720, 255184, 375296, 547746, 802690, 1169748, 1708828, 2488792, 3641134, 5318124, 7778660, 11346426, 16583046, 24197884 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 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-4) +a(n-5) -3*a(n-6) +2*a(n-7) +a(n-8) -9*a(n-9) +2*a(n-10) +4*a(n-11) -3*a(n-12) +7*a(n-13) -5*a(n-15) -a(n-17) +a(n-18) +a(n-19) for n>26

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A345586 A345844 A253694 * A255804 A351802 A050240

Adjacent sequences:  A253698 A253699 A253700 * A253702 A253703 A253704

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2015

STATUS

approved

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Last modified May 23 18:08 EDT 2022. Contains 353993 sequences. (Running on oeis4.)