A229585 Number of defective 3-colorings of an n X 7 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.

96, 5724, 264300, 11035044, 435326724, 16551428868, 613195191972, 22285439501940, 798023885879412, 28242628279003332, 990013172442084324, 34429588531063458516, 1189375483329032617620, 40853134231990887545316

Offset: 1

Author

R. H. Hardin, Sep 26 2013

Keywords

• nonn

Comments

Column 7 of A229586.

Examples

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

Links

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

Crossrefs

Cf. A229586.

Formula

Empirical: a(n) = 84*a(n-1) - 2466*a(n-2) + 31428*a(n-3) - 206469*a(n-4) + 750384*a(n-5) - 1513404*a(n-6) + 1574640*a(n-7) - 656100*a(n-8).