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A256729
Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum zero and no antidiagonal sum three
1
2304, 21904, 186624, 1648656, 14137600, 122323600, 1047687424, 9002973456, 77177284864, 662446232464, 5681548960000, 48744134890000, 418086024911104, 3586417795077264, 30762931758747904, 263883025624611600
OFFSET
1,1
COMMENTS
Column 2 of A256735
LINKS
FORMULA
Empirical: a(n) = 13*a(n-1) -39*a(n-2) -69*a(n-3) +1104*a(n-4) -4048*a(n-5) +3968*a(n-6) -19840*a(n-7) +92928*a(n-8) -52992*a(n-9) -98304*a(n-10) +180224*a(n-11) -393216*a(n-12) +2097152*a(n-13) -12582912*a(n-14) +16777216*a(n-15)
EXAMPLE
Some solutions for n=3
..0..0..0..1....0..1..0..1....0..1..0..1....0..0..0..0....0..1..0..1
..0..1..0..1....1..0..0..0....0..0..1..0....0..1..0..0....1..0..0..1
..0..1..1..1....1..1..1..0....1..0..1..0....1..1..0..1....0..1..1..0
..0..0..1..0....0..0..1..0....0..0..1..0....0..1..1..1....0..0..1..0
..1..0..1..1....1..1..1..0....0..0..0..1....1..0..1..0....0..0..1..0
CROSSREFS
Sequence in context: A281927 A179699 A195652 * A204102 A177759 A218431
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2015
STATUS
approved