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A237009
Number of (n+1)X(2+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal
1
704, 1632, 3928, 10776, 30248, 92328, 286168, 938568, 3112424, 10749192, 37426648, 134315976, 484881128, 1790797128, 6641272408, 25056319368, 94795789544, 363296575752, 1394805770968, 5407003029576, 20984006066408, 82025728803528
OFFSET
1,1
COMMENTS
Column 2 of A237015
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) +16*a(n-2) -268*a(n-3) +189*a(n-4) +3388*a(n-5) -5824*a(n-6) -20048*a(n-7) +49756*a(n-8) +52752*a(n-9) -196896*a(n-10) -24192*a(n-11) +369216*a(n-12) -131328*a(n-13) -262656*a(n-14) +165888*a(n-15)
EXAMPLE
Some solutions for n=5
..0..3..0....3..1..2....1..1..1....1..1..1....2..0..2....2..0..2....1..2..1
..1..1..1....0..2..1....1..3..1....2..2..2....1..3..1....3..0..3....2..2..2
..2..1..2....3..1..2....1..1..1....0..2..0....0..2..0....0..2..0....3..0..3
..0..2..0....0..2..1....2..2..2....1..3..1....1..3..1....1..2..1....2..2..2
..1..2..1....3..1..2....1..1..1....0..2..0....0..2..0....0..2..0....2..1..2
..0..2..0....0..2..1....3..1..3....1..3..1....3..1..3....0..3..0....3..1..3
CROSSREFS
Sequence in context: A185807 A105846 A323342 * A185568 A185799 A186916
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2014
STATUS
approved