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A250969
Number of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements
1
604, 12281, 249921, 5089900, 103684186, 2112130109, 43025963570, 876479703950, 17854730951799, 363717955042320, 7409282841342444, 150934183848595064, 3074673806193093731, 62634048639412217021, 1275915526747412367745
OFFSET
1,1
COMMENTS
Column 4 of A250973
LINKS
FORMULA
Empirical: a(n) = 32*a(n-1) -322*a(n-2) +2227*a(n-3) -12086*a(n-4) +47762*a(n-5) -142463*a(n-6) +321616*a(n-7) -516143*a(n-8) +570208*a(n-9) -437734*a(n-10) +223620*a(n-11) -61118*a(n-12) +2048*a(n-13) -581*a(n-14) +2307*a(n-15) -712*a(n-16) +60*a(n-17)
EXAMPLE
Some solutions for n=2
..1..0..1..1..0....0..1..1..0..1....1..0..1..0..0....0..1..1..0..1
..1..1..0..1..0....1..1..1..0..1....1..0..1..0..0....1..0..1..1..0
..0..1..0..1..1....0..0..0..1..1....0..1..0..0..0....0..1..0..0..1
CROSSREFS
Sequence in context: A321269 A234343 A234338 * A265244 A228036 A274765
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 29 2014
STATUS
approved