A209221 Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 1 1 vertically.

15, 225, 240, 504, 900, 1776, 3456, 6300, 12656, 24124, 45276, 88400, 170280, 323760, 618496, 1202400, 2300200, 4360824, 8464860, 16284576, 30897024, 59537156, 115023968, 219164204, 419459908, 811024296, 1553149080, 2962595040

Offset: 1

Author

R. H. Hardin Mar 06 2012

Keywords

• nonn

Comments

Column 5 of A209224

Examples

			Some solutions for n=4
..1..1..1..0..1....1..1..0..1..1....1..1..1..1..1....0..0..1..1..0
..0..0..1..1..0....1..1..0..0..1....1..1..0..0..1....1..1..0..1..1
..1..0..0..1..1....0..0..1..1..0....0..0..1..1..0....1..1..1..0..1
..1..1..1..0..1....1..1..1..1..0....0..0..1..1..1....0..0..1..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 9*a(n-3) +2*a(n-4) -33*a(n-6) +10*a(n-7) +3*a(n-8) +66*a(n-9) -33*a(n-10) +5*a(n-11) -83*a(n-12) +39*a(n-13) -20*a(n-14) +78*a(n-15) +3*a(n-16) -7*a(n-17) -45*a(n-18) -30*a(n-19) +8*a(n-20) +22*a(n-21) +10*a(n-22) +2*a(n-23) -6*a(n-24) +a(n-25) +a(n-27) for n>29