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A253693 Number of (n+1)X(3+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
104, 150, 234, 480, 878, 1472, 2982, 5282, 9880, 18552, 34284, 63796, 119066, 220728, 411972, 765790, 1424918, 2652268, 4936064, 9184756, 17094616, 31807790, 59199066, 110166458, 205014144, 381521314, 710006568, 1321296952, 2458905244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 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) -6*a(n-6) -12*a(n-7) -6*a(n-8) +2*a(n-9) +5*a(n-10) +11*a(n-11) +5*a(n-12) -5*a(n-13) -a(n-14) -2*a(n-16) +a(n-17) -a(n-19) for n>21

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A054903 A074228 A298505 * A168528 A259767 A234261

Adjacent sequences:  A253690 A253691 A253692 * A253694 A253695 A253696

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2015

STATUS

approved

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Last modified May 7 19:02 EDT 2021. Contains 343652 sequences. (Running on oeis4.)