A217953 Number of n element 0..3 arrays with each element the minimum of 7 adjacent elements of a random 0..3 array of n+6 elements.

4, 16, 50, 130, 296, 610, 1163, 2083, 3558, 5902, 9734, 16410, 28969, 54049, 105529, 211097, 423650, 840654, 1636964, 3121556, 5839194, 10760322, 19647966, 35780070, 65376302, 120393728, 223926347, 420463887, 795087960, 1508967508, 2864523898

Offset: 1

Author

R. H. Hardin Oct 15 2012

Keywords

• nonn

Comments

Column 7 of A217954

Examples

			Some solutions for n=4
..3....2....0....3....1....0....1....1....1....0....1....0....1....0....1....3
..2....2....3....1....3....1....1....1....3....1....2....3....3....2....2....3
..1....2....2....0....2....2....0....3....2....2....3....2....0....3....1....3
..1....1....1....0....2....2....0....3....1....0....3....2....0....3....1....3
		

Links

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

Formula

Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +6*a(n-8) -4*a(n-9) +6*a(n-10) +4*a(n-11) +5*a(n-12) +6*a(n-13) +7*a(n-14) +8*a(n-15) +4*a(n-16) +6*a(n-17) +5*a(n-18) +4*a(n-19) +3*a(n-20) +2*a(n-21) +a(n-22)