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A207690
Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically
1
15, 225, 240, 768, 1872, 4216, 10000, 24420, 59616, 138724, 336400, 811240, 1923276, 4654480, 11091620, 26621504, 64022280, 152678176, 367544432, 879654400, 2106871848, 5061876412, 12106779344, 29061344972, 69658807392, 166845800312
OFFSET
1,1
COMMENTS
Column 5 of A207693
LINKS
FORMULA
Empirical: a(n) = a(n-2) +12*a(n-3) +2*a(n-4) +12*a(n-5) -56*a(n-6) +12*a(n-7) -42*a(n-8) +143*a(n-9) -13*a(n-10) +33*a(n-11) -192*a(n-12) -6*a(n-13) +43*a(n-14) +175*a(n-15) +11*a(n-16) -57*a(n-17) -102*a(n-18) +5*a(n-19) +10*a(n-20) +39*a(n-21) +2*a(n-23) -9*a(n-24) +a(n-27) for n>29
EXAMPLE
Some solutions for n=4
..0..1..1..0..1....1..1..0..1..1....0..1..1..1..0....1..1..0..0..1
..1..1..0..1..1....0..1..1..0..0....1..1..0..0..1....1..0..1..1..0
..0..0..1..1..0....1..0..0..1..1....1..0..1..1..1....0..1..1..1..1
..1..1..1..0..1....0..1..1..0..1....0..1..1..1..0....1..1..0..0..1
CROSSREFS
Sequence in context: A171320 A078364 A209221 * A207925 A208105 A207726
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 19 2012
STATUS
approved