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A253695 Number of (n+1)X(5+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
680, 540, 618, 992, 1632, 2386, 4180, 6552, 10696, 18236, 28352, 47594, 80548, 128248, 216740, 356714, 584026, 981652, 1609356, 2663806, 4459244, 7313942, 12171062, 20237510, 33418882, 55628622, 92193244, 152691570, 254244632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A253698

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +2*a(n-3) +4*a(n-4) +2*a(n-5) -7*a(n-6) -17*a(n-7) -7*a(n-8) -8*a(n-9) -10*a(n-10) +38*a(n-11) +42*a(n-12) +3*a(n-13) +28*a(n-14) +a(n-15) -60*a(n-16) -17*a(n-17) -16*a(n-18) -40*a(n-19) +14*a(n-20) +20*a(n-21) -a(n-22) +16*a(n-23) +8*a(n-24) +4*a(n-26) for n>31

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A200828 A097772 A257828 * A253702 A235013 A154036

Adjacent sequences:  A253692 A253693 A253694 * A253696 A253697 A253698

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2015

STATUS

approved

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Last modified January 28 06:26 EST 2022. Contains 350654 sequences. (Running on oeis4.)