A218175 Number of nX2 arrays of the minimum value of corresponding elements and their horizontal and vertical neighbors in a random 0..3 nX2 array.

4, 28, 192, 956, 5494, 30888, 172038, 964828, 5400158, 30225794, 169223054, 947302656, 5303071898, 29687164126, 166191023656, 930351759572, 5208189255764, 29155886563482, 163217149535782, 913703559802622

Offset: 1

Author

R. H. Hardin Oct 22 2012

Keywords

• nonn

Comments

Column 2 of A218181

Examples

			Some solutions for n=3
..0..0....1..3....2..2....0..0....2..2....2..2....2..2....2..3....2..1....0..0
..0..0....1..1....2..2....1..0....0..3....0..0....3..0....0..1....0..0....0..0
..3..0....1..3....2..3....1..1....0..0....0..0....0..0....0..0....0..0....1..1
		

Links

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

Formula

Empirical: a(n) = 4*a(n-1) +8*a(n-2) +13*a(n-3) -33*a(n-4) -36*a(n-5) -86*a(n-6) -145*a(n-7) -161*a(n-8) +132*a(n-9) +538*a(n-10) +364*a(n-11) -112*a(n-12) -32*a(n-13)