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A208267
Number of nX6 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors
1
32, 1129, 42563, 1592731, 59655167, 2234126207, 83670667271, 3133560234217, 117355367786585, 4395090865370635, 164601109918978615, 6164497208894901477, 230867373009598884627, 8646243499452479433569, 323811570588787197424201
OFFSET
1,1
COMMENTS
Column 6 of A208269
LINKS
FORMULA
Empirical: a(n) = 36*a(n-1) +120*a(n-2) -2391*a(n-3) -3905*a(n-4) +50702*a(n-5) +27152*a(n-6) -396016*a(n-7) +154999*a(n-8) +751787*a(n-9) -499260*a(n-10) -410368*a(n-11) +355981*a(n-12) +38077*a(n-13) -70276*a(n-14) +6203*a(n-15) +3386*a(n-16) -622*a(n-17) +28*a(n-18)
EXAMPLE
Some solutions for n=4
..0..0..0..1..1..0....0..0..0..0..0..0....0..0..0..1..0..0....0..0..0..1..0..0
..0..1..1..1..0..1....1..0..1..0..1..0....0..1..1..1..0..1....0..1..1..0..0..1
..1..0..1..0..1..0....0..0..1..0..1..1....0..0..0..1..0..1....0..1..0..0..1..1
..1..1..0..0..0..0....0..1..0..0..1..0....1..1..1..0..1..0....0..1..1..0..1..0
CROSSREFS
Sequence in context: A249392 A114933 A038097 * A184758 A189956 A318014
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2012
STATUS
approved