A184470 1/6 the number of (n+2)X4 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last

1095, 2755, 7085, 19119, 62213, 200215, 645837, 2386807, 8440325, 29121087, 112850957, 413112487, 1461095205, 5765335615, 21394180445, 76423033479, 303819408773, 1133934761455, 4067862256797, 16225029630247, 60710982378005

Offset

1,1

Comments

Column 2 of A184477

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=5*a(n-1)-6*a(n-2)+123*a(n-3)-615*a(n-4)+738*a(n-5)-5552*a(n-6)+27760*a(n-7)-33312*a(n-8)+122328*a(n-9)-611640*a(n-10)+733968*a(n-11)-1443600*a(n-12)+7218000*a(n-13)-8661600*a(n-14)+9366192*a(n-15)-46830960*a(n-16)+56197152*a(n-17)-32980608*a(n-18)+164903040*a(n-19)-197883648*a(n-20)+58413312*a(n-21)-292066560*a(n-22)+350479872*a(n-23)-40310784*a(n-24)+201553920*a(n-25)-241864704*a(n-26)

Example

Some solutions with a(1,1)=0 for 6X4
..0..0..0..2....0..1..1..0....0..1..1..0....0..1..0..1....0..0..2..0
..2..2..0..0....1..1..0..0....0..1..2..0....1..0..0..1....2..0..2..1
..2..2..1..2....0..2..0..1....0..1..0..0....1..2..1..0....1..2..0..2
..0..0..0..2....1..0..1..1....0..1..1..0....0..1..0..1....0..0..2..0
..2..2..0..0....1..0..1..0....1..0..2..1....0..1..0..0....2..2..0..1
..2..1..2..2....0..2..0..1....0..1..0..0....1..2..1..0....1..2..0..2

Crossrefs

Sequence in context: A124122 A163561 A203807 * A234722 A160370 A123366

Adjacent sequences: A184467 A184468 A184469 * A184471 A184472 A184473

Keyword

nonn

Author

R. H. Hardin Jan 15 2011

Status

approved