A218760 Unmatched value maps: number of nX3 binary arrays indicating the locations of corresponding elements not equal to any horizontal or vertical neighbor in a random 0..1 nX3 array.

4, 18, 90, 403, 1876, 8697, 40383, 187413, 869598, 4035492, 18727387, 86907272, 403304737, 1871588753, 8685363409, 40305616278, 187043701224, 868001747571, 4028080274884, 18692855005565, 86746738864403, 402560052640421

Offset: 1

Author

R. H. Hardin Nov 05 2012

Keywords

• nonn

Comments

Column 3 of A218765

Examples

			Some solutions for n=3
..1..0..1....1..0..1....0..0..0....0..1..0....0..0..1....1..0..0....0..0..0
..0..0..0....0..0..0....1..0..0....0..0..0....0..1..1....1..0..0....0..1..0
..0..1..0....1..0..0....1..1..1....0..0..1....1..1..1....1..1..0....1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..63

Formula

Empirical: a(n) = 4*a(n-1) +a(n-2) +7*a(n-3) +11*a(n-4) +2*a(n-5) -28*a(n-6) -11*a(n-7) -4*a(n-8) -13*a(n-9) +12*a(n-10) -137*a(n-11) -48*a(n-12) +129*a(n-13) +31*a(n-14) -51*a(n-15) -32*a(n-16) +6*a(n-17) +10*a(n-18) +2*a(n-19)