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A241373
Number of 4Xn 0..2 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order
1
14, 326, 7376, 169982, 3910194, 90008909, 2071815945, 47690157718, 1097756412666, 25268747760871, 581649645222695, 13388725521741539, 308188912773527912, 7094058807175007496, 163294876256510271215
OFFSET
1,1
COMMENTS
Row 4 of A241370
LINKS
FORMULA
Empirical: a(n) = 32*a(n-1) -214*a(n-2) +26*a(n-3) +3879*a(n-4) -15470*a(n-5) +19107*a(n-6) +72463*a(n-7) -211026*a(n-8) +106996*a(n-9) +193844*a(n-10) -2000756*a(n-11) +412552*a(n-12) +8652096*a(n-13) -3035456*a(n-14) -10691648*a(n-15) +6530688*a(n-16) +2014720*a(n-17) -6114304*a(n-18) +2244608*a(n-19) +1933312*a(n-20) -720896*a(n-21) for n>23
EXAMPLE
Some solutions for n=4
..0..1..0..2....0..1..0..2....0..1..0..2....0..1..1..2....0..1..0..0
..0..2..0..1....0..1..2..0....1..0..2..0....0..1..1..0....2..1..0..0
..1..2..0..2....0..2..0..0....1..2..1..2....1..1..1..0....2..0..2..0
..1..2..0..2....0..2..0..1....0..2..1..2....1..1..0..2....1..2..1..0
CROSSREFS
Sequence in context: A275500 A275397 A275262 * A090598 A277769 A060075
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 20 2014
STATUS
approved