A251422 Number of length n+2 0..2 arrays with the sum of the maximum minus twice the median plus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero.

9, 41, 97, 341, 1003, 3129, 9439, 28717, 86695, 261789, 788373, 2372693, 7133179, 21434717, 64377579, 193296317, 580236633, 1741470477, 5226041293, 15681654949, 47052540983, 141173946441, 423556852705, 1270745764685, 3812398439683

Offset: 1

Author

R. H. Hardin, Dec 02 2014

Keywords

• nonn

Comments

Column 2 of A251428

Examples

			Some solutions for n=9
..1....2....1....1....2....0....0....0....1....2....1....1....2....0....2....0
..0....2....1....1....0....1....0....2....0....1....1....2....2....1....1....1
..0....0....2....0....2....0....2....0....0....1....1....2....0....0....1....2
..1....0....1....2....0....2....1....1....2....1....2....1....1....0....1....0
..2....0....1....1....1....0....2....2....0....2....1....1....1....2....1....1
..2....1....0....0....2....1....1....2....0....1....1....1....2....2....0....2
..2....1....2....1....1....1....2....2....0....2....2....2....1....0....1....0
..1....2....2....2....1....0....1....2....2....0....1....0....1....1....0....1
..1....1....2....0....0....0....1....1....1....2....0....0....1....2....1....1
..1....2....2....0....1....2....1....1....1....0....0....0....0....1....2....0
..2....1....2....2....2....2....2....0....1....2....0....2....1....2....2....2
		

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) +12*a(n-3) +36*a(n-4) -66*a(n-5) +25*a(n-6) +56*a(n-7) -58*a(n-8) -56*a(n-9) +63*a(n-10) +8*a(n-11) +54*a(n-12) -80*a(n-13) +24*a(n-14)