A207905 Number of nX5 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.

15, 225, 1071, 4089, 13865, 39831, 110775, 289467, 730377, 1811997, 4393069, 10558951, 25146429, 59475625, 140190519, 329138641, 771108603, 1803405621, 4211351857, 9825749755, 22905455175, 53364801587, 124272402673, 289284276825

Offset: 1

Author

R. H. Hardin Feb 21 2012

Keywords

• nonn

Comments

Column 5 of A207908

Examples

			Some solutions for n=4
..0..1..1..1..0....0..0..1..1..0....1..1..1..1..1....1..0..1..1..0
..1..1..1..0..1....1..1..1..1..1....1..1..1..1..0....0..1..1..1..0
..0..1..1..0..0....0..0..1..1..0....0..0..1..1..0....1..0..0..1..1
..0..0..1..1..1....1..0..1..1..1....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) = 6*a(n-1) -8*a(n-2) -10*a(n-3) +3*a(n-4) +80*a(n-5) -71*a(n-6) -74*a(n-7) -24*a(n-8) +242*a(n-9) -136*a(n-10) +56*a(n-11) -102*a(n-12) +102*a(n-13) -348*a(n-14) +344*a(n-15) -2*a(n-16) +120*a(n-17) -298*a(n-18) +222*a(n-19) -192*a(n-20) +82*a(n-21) -56*a(n-22) +142*a(n-23) -104*a(n-24) +48*a(n-25) -26*a(n-26) +18*a(n-27) -27*a(n-28) +18*a(n-29) -6*a(n-30) +2*a(n-31) -a(n-32) +2*a(n-33) -a(n-34)