A229636 Number of defective 3-colorings of an n X 7 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.

120, 5392, 136778, 3723370, 98015235, 2495874984, 61836040854, 1498317588826, 35650331594818, 835527599342816, 19334282699326025, 442561024351155220, 10035487974561746994, 225705889177614527760, 5039777091823275662663

Offset: 1

Author

R. H. Hardin, Sep 27 2013

Keywords

• nonn

Comments

Column 7 of A229637.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 57

Formula

Empirical recurrence of order 57 (see link above).