A206469 Number of (n+1)X6 0..2 arrays with every 2X2 subblock having zero permanent.

7225, 958441, 23707161, 1693734025, 61244865529, 3420616959081, 144660587865049, 7310031634630729, 329657818912939449, 15990423345433902121, 740325481079134598041, 35313542504161253544969

Offset: 1

Author

R. H. Hardin Feb 08 2012

Keywords

• nonn

Comments

Column 5 of A206472

Examples

			Some solutions for n=4
..0..0..2..0..2..2....2..1..2..1..2..2....2..0..2..2..1..0....2..2..0..0..2..1
..0..0..0..0..0..0....0..0..0..0..0..0....2..0..0..0..0..0....0..0..0..0..0..0
..0..0..2..0..0..2....2..2..2..1..1..1....0..0..0..0..2..1....2..2..0..2..2..0
..2..0..1..0..0..0....0..0..0..0..0..0....0..2..0..0..0..0....0..0..0..0..0..0
..1..0..1..0..0..2....0..2..1..2..1..1....0..2..0..0..0..2....2..1..2..2..1..2
		

Links

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

Formula

Empirical: a(n) = 55*a(n-1) +978*a(n-2) -78848*a(n-3) +185192*a(n-4) [phone]*a(n-5) -254580608*a(n-6) -5080783360*a(n-7) [phone]*a(n-8) [phone]*a(n-9) -4555145707520*a(n-10) -1650631114752*a(n-11) [phone]*a(n-12) -230333727375360*a(n-13) -1370695862845440*a(n-14) +3206175906594816*a(n-15)