A252171 Number of length n+2 0..2 arrays with the sum of the maximum minus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero.

3, 49, 83, 369, 957, 3217, 9295, 28977, 86267, 262541, 787121, 2374869, 7129517, 21441049, 64366847, 193314809, 580205169, 1741524549, 5225949099, 15681813101, 47052271005, 141174409049, 423556062389, 1270747118001, 3812396126529

Offset: 1

Author

R. H. Hardin, Dec 15 2014

Keywords

• nonn

Comments

Column 2 of A252177

Examples

			Some solutions for n=6
..0....0....2....0....1....2....0....1....1....0....1....2....0....1....0....2
..1....0....2....1....1....2....0....0....0....2....1....0....1....2....1....0
..2....0....1....0....1....1....0....0....1....0....0....2....1....0....0....0
..1....0....2....0....2....1....2....2....2....1....2....2....0....2....1....2
..1....0....1....2....1....1....2....1....0....0....2....2....1....0....2....0
..0....1....1....2....0....0....2....2....1....0....0....1....1....2....2....2
..0....1....2....1....1....1....0....0....0....0....1....1....1....2....2....2
..2....1....1....2....1....2....1....2....2....2....0....1....1....0....1....0
		

Links

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

Formula

Empirical: a(n) = 8*a(n-1) -21*a(n-2) +10*a(n-3) +54*a(n-4) -128*a(n-5) +125*a(n-6) -142*a(n-8) +176*a(n-9) -199*a(n-10) +216*a(n-11) -150*a(n-12) +80*a(n-13) -24*a(n-14)