A234791 Number of (n+1)X(3+1) 0..3 arrays with each 2X2 subblock having the number of clockwise edge increases less than or equal to the number of counterclockwise edge increases

30536, 3015344, 280996212, 25695321008, 2334950105532, 211733037460400, 19186434495264308, 1738191883121101472, 157458806627700653996, 14263455372346522807504, 1292048182581018711385700

Offset

1,1

Comments

Column 3 of A234796

Links

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

Formula

Empirical: a(n) = 174*a(n-1) -10322*a(n-2) +299192*a(n-3) -4916088*a(n-4) +49495654*a(n-5) -320524051*a(n-6) +1381581872*a(n-7) -4047000461*a(n-8) +7991340866*a(n-9) -9739200284*a(n-10) +4224246488*a(n-11) +8026590994*a(n-12) -17876492846*a(n-13) +17714584733*a(n-14) -10616721904*a(n-15) +4045200724*a(n-16) -893202136*a(n-17) +59914260*a(n-18) -25923040*a(n-19) +42766000*a(n-20) -12448000*a(n-21)

Example

Some solutions for n=1
..0..1..1..3....2..2..1..0....3..2..1..1....2..0..2..0....0..1..2..1
..0..1..2..3....0..0..0..1....2..3..1..3....2..0..0..3....1..2..1..3

Crossrefs

Sequence in context: A278271 A332315 A254976 * A134118 A235853 A237636

Adjacent sequences: A234788 A234789 A234790 * A234792 A234793 A234794

Keyword

nonn

Author

R. H. Hardin, Dec 30 2013

Status

approved