A202799 Number of nX5 binary arrays with every one adjacent to another one horizontally or vertically.

12, 454, 11988, 311144, 8222576, 217145076, 5730640104, 151245101550, 3991784606164, 105354316048660, 2780593210008194, 73387575404296206, 1936901875857360748, 51120219046394982056, 1349204535780755578282

Offset: 1

Author

R. H. Hardin Dec 24 2011

Keywords

• nonn

Comments

Column 5 of A202802

Examples

			Some solutions for n=3
..1..1..1..0..0....0..0..1..1..1....1..1..1..1..1....1..1..0..0..1
..0..0..0..0..1....0..1..1..1..0....0..1..0..1..1....1..0..1..0..1
..1..1..1..1..1....0..0..1..1..1....1..1..1..0..1....1..1..1..0..0
		

Links

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

Formula

Empirical: a(n) = 27*a(n-1) -82*a(n-2) +1720*a(n-3) -876*a(n-4) +36142*a(n-5) +36267*a(n-6) +228084*a(n-7) +1329202*a(n-8) -3356034*a(n-9) -15601554*a(n-10) +6682402*a(n-11) [phone]*a(n-12) +8454105*a(n-13) -144765880*a(n-14) -62367040*a(n-15) [phone]*a(n-16) [phone]*a(n-17) -212078096*a(n-18) -315914880*a(n-19) -123060608*a(n-20) -12403456*a(n-21) [phone]*a(n-22) [phone]*a(n-23) [phone]*a(n-24) [phone]*a(n-25) [phone]*a(n-26) [phone]*a(n-27)