login
A253692
Number of (n+1)X(2+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
40, 76, 146, 304, 602, 1182, 2416, 4772, 9652, 19152, 38524, 76996, 154072, 308634, 617062, 1236382, 2472602, 4951496, 9907740, 19832536, 39695188, 79445558, 159023072, 318264564, 637042828, 1275004742, 2551980574, 5107782140
OFFSET
1,1
COMMENTS
Column 2 of A253698
LINKS
FORMULA
Empirical: a(n) = 4*a(n-2) +2*a(n-3) -2*a(n-4) -a(n-5) -7*a(n-6) -3*a(n-7) +9*a(n-8) +3*a(n-9) +a(n-10) -a(n-11) -6*a(n-12) +4*a(n-14) -a(n-16)
EXAMPLE
Some solutions for n=4
..1..0..1....1..1..1....0..0..1....1..1..0....0..1..0....0..0..1....0..0..1
..1..1..0....0..1..1....1..0..1....0..1..0....0..1..1....1..1..0....0..0..0
..0..0..1....1..0..0....1..1..0....0..0..1....1..0..0....1..1..0....0..1..1
..1..0..0....0..1..0....0..0..1....1..1..0....0..1..0....0..0..1....1..0..1
..0..1..1....0..0..0....1..0..0....0..1..0....1..1..0....1..0..0....1..0..1
CROSSREFS
Sequence in context: A260537 A044106 A044487 * A253699 A037975 A317095
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 09 2015
STATUS
approved