A184491 Number of (n+1)X4 0..2 arrays with every 2X2 subblock sum greater than 4

792, 20514, 421879, 9573698, 209361859, 4649028105, 102612963762, 2270452765634, 50187203345248, 1109807953423781, 24537612768982878, 542556880890398985, 11996283587851942891, 265248437061417663664

Offset

1,1

Comments

Column 3 of A184497

Links

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

Formula

Empirical: a(n)=14*a(n-1)+235*a(n-2)-835*a(n-3)-9872*a(n-4)+18170*a(n-5)+157753*a(n-6)-198571*a(n-7)-1173439*a(n-8)+1189558*a(n-9)+4436018*a(n-10)-3898484*a(n-11)-9184174*a(n-12)+7095216*a(n-13)+11019526*a(n-14)-7342318*a(n-15)-7892736*a(n-16)+4325550*a(n-17)+3382616*a(n-18)-1396572*a(n-19)-837900*a(n-20)+220320*a(n-21)+107712*a(n-22)-12096*a(n-23)-5184*a(n-24)

Example

Some solutions for 3X4
..2..1..2..1....1..0..1..2....1..1..2..2....0..2..0..2....1..2..1..2
..2..2..2..1....2..2..2..2....2..2..0..2....2..2..2..2....2..2..2..2
..2..1..1..1....1..1..1..2....1..2..2..2....0..2..0..2....2..0..2..0

Crossrefs

Sequence in context: A104680 A037190 A209893 * A140909 A282461 A281935

Adjacent sequences: A184488 A184489 A184490 * A184492 A184493 A184494

Keyword

nonn

Author

R. H. Hardin Jan 15 2011

Status

approved