A262423 Number of (4+1)X(n+1) 0..1 arrays with each row divisible by 3 and column not divisible by 3, read as a binary number with top and left being the most significant bits.

21, 48, 1701, 18228, 428301, 7577424, 163388421, 3287265300, 69481709901, 1443547193328, 30363542104581, 635919555126708, 13359727300650381, 280364385485387664, 5888252348126720901, 123632237885054793300

Offset: 1

Author

R. H. Hardin, Sep 22 2015

Keywords

• nonn

Comments

Row 4 of A262420.

Examples

			Some solutions for n=4
..0..0..1..1..0....1..0..1..0..1....1..1..0..0..0....1..0..0..1..0
..0..0..0..0..0....0..1..0..0..1....0..0..0..1..1....1..0..0..1..0
..1..1..0..0..0....1..1..0..1..1....0..0..1..1..0....1..0..0..1..0
..0..1..0..0..1....1..1..0..0..0....0..0..1..1..0....0..1..0..0..1
..0..1..1..0..0....1..0..0..1..0....0..1..1..0..0....0..0..1..1..0
		

Links

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

Crossrefs

Cf. A262420.

Formula

Empirical: a(n) = 21*a(n-1) +189*a(n-2) -3969*a(n-3) -10719*a(n-4) +225099*a(n-5) +250803*a(n-6) -5266863*a(n-7) -2527200*a(n-8) [phone]*a(n-9) +9062928*a(n-10) -190321488*a(n-11)