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A252328
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 8 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 8
1
4006, 5716, 6222, 9142, 19540, 40178, 89296, 225890, 497694, 1164378, 3023806, 6718012, 15867518, 41386930, 92031834, 218076968, 570018794, 1268404738, 3011283796, 7879627958, 17542740780, 41694280764, 109139194282, 243061709942
OFFSET
1,1
COMMENTS
Column 2 of A252334
LINKS
FORMULA
Empirical: a(n) = 32*a(n-3) -387*a(n-6) +2471*a(n-9) +36*a(n-11) -9991*a(n-12) -608*a(n-14) +28435*a(n-15) +3864*a(n-17) -57755*a(n-18) -12220*a(n-20) +80353*a(n-21) +21492*a(n-23) -72696*a(n-24) -21936*a(n-26) +40261*a(n-27) +12888*a(n-29) -12434*a(n-30) -4084*a(n-32) +1808*a(n-33) +600*a(n-35) -96*a(n-36) -32*a(n-38) for n>42
EXAMPLE
Some solutions for n=4
..3..3..2..0....0..2..1..2....1..1..3..1....0..0..3..3....0..2..3..3
..2..2..1..0....3..0..2..3....2..2..1..0....0..1..2..2....3..2..0..3
..0..3..2..0....0..3..2..0....2..2..1..2....3..2..3..0....2..1..2..2
..3..0..2..3....2..2..1..0....1..1..3..1....3..2..0..3....0..2..3..0
..0..2..1..2....3..0..0..3....2..2..1..2....2..1..2..0....3..2..0..3
..3..3..2..3....0..1..2..0....2..2..1..2....0..2..3..0....2..1..2..2
CROSSREFS
Sequence in context: A092722 A034306 A228579 * A235307 A193552 A107285
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2014
STATUS
approved