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A253694 Number of (n+1)X(4+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, 282, 356, 700, 1120, 1638, 3136, 4782, 7926, 14462, 22656, 39334, 68068, 110254, 193022, 326064, 542916, 941302, 1578364, 2668696, 4579938, 7691528, 13087264, 22287082, 37577096, 64014484, 108601422, 183741636, 312684956, 529783652 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A253698

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A065570 A345586 A345844 * A253701 A255804 A351802

Adjacent sequences:  A253691 A253692 A253693 * A253695 A253696 A253697

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 09 2015

STATUS

approved

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Last modified August 11 20:13 EDT 2022. Contains 356067 sequences. (Running on oeis4.)