A229605 Number of defective 3-colorings of an n X 7 0..2 array connected horizontally and vertically with exactly two mistakes, and colors introduced in row-major 0..2 order.

120, 15795, 792929, 31848813, 1153135492, 39229935270, 1279020266434, 40413033646242, 1246326317951687, 37697561397216125, 1122224822297521683, 32965710304040001780, 957481537679788357971, 27540249663372893582723

Offset: 1

Author

R. H. Hardin, Sep 26 2013

Keywords

• nonn

Comments

Column 7 of A229606.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 46

Crossrefs

Cf. A229606.

Formula

Empirical recurrence of order 46 (see link above).