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.

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

Author

R. H. Hardin Feb 19 2012

Keywords

• nonn

Comments

Column 5 of A207693

Examples

			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
		

Links

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

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