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A254476
Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal sum minus antidiagonal minimum nondecreasing horizontally and vertically
2
512, 2696, 12260, 47140, 170504, 586508, 1964388, 6462708, 21003228, 67662328, 216533720, 689480684, 2187191068, 6918332408, 21836278536, 68808353156, 216551437648, 680873827704, 2139217784216, 6717384585616, 21084279168188
OFFSET
1,1
COMMENTS
Column 1 of A254483
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) -8*a(n-2) -9*a(n-3) +19*a(n-4) +4*a(n-5) -22*a(n-6) +23*a(n-7) +5*a(n-8) -162*a(n-9) +276*a(n-10) -83*a(n-11) -50*a(n-12) +218*a(n-13) -326*a(n-14) +66*a(n-15) +9*a(n-16) -60*a(n-17) +78*a(n-18) +5*a(n-19) +23*a(n-20) -6*a(n-21) +4*a(n-22) -a(n-23) -5*a(n-24) -2*a(n-26) -a(n-27) for n>32
EXAMPLE
Some solutions for n=4
..0..0..1....0..0..1....1..1..0....0..0..1....0..1..1....0..0..1....1..0..1
..1..1..0....0..0..1....0..0..0....0..1..1....1..0..0....0..0..1....0..1..0
..0..1..0....1..0..1....1..1..1....1..1..0....1..1..1....0..1..0....1..1..0
..1..1..0....1..0..1....1..1..1....1..1..0....1..0..0....1..0..1....1..1..0
..1..1..1....1..1..1....1..0..1....0..0..0....0..0..1....1..1..1....0..1..1
..0..1..1....1..1..1....0..1..1....1..1..1....1..1..1....1..1..1....1..0..1
CROSSREFS
Sequence in context: A186832 A254553 A254483 * A254804 A253820 A253813
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 31 2015
STATUS
approved