A239651 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4

10, 112, 1182, 12246, 127454, 1320102, 13703468, 142051652, 1473731150, 15282171258, 158517866826, 1643986061990, 17051506678146, 176848369394606, 1834236131924494, 19023918997995414, 197310588661661646

Offset

1,1

Comments

Row 3 of A239649

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +73*a(n-2) -446*a(n-3) -1413*a(n-4) +8070*a(n-5) +12185*a(n-6) -63420*a(n-7) -49358*a(n-8) +220534*a(n-9) +39486*a(n-10) -241802*a(n-11) +244780*a(n-12) -89648*a(n-13) -386680*a(n-14) -228008*a(n-15) +129984*a(n-16) -457816*a(n-17) -1064416*a(n-18) -330768*a(n-19) +556128*a(n-20) -351872*a(n-21) +769280*a(n-22) +407552*a(n-23) -200704*a(n-24) +32768*a(n-25)

Example

Some solutions for n=5
..1..0..3..1..0....3..0..1..3..0....3..1..1..3..1....1..0..0..0..0
..2..1..0..1..1....2..1..2..2..1....2..0..0..3..0....2..0..0..0..1
..3..1..2..1..1....2..0..0..0..0....1..0..2..2..2....3..0..0..0..0

Crossrefs

Sequence in context: A046164 A322724 A184131 * A014484 A110040 A298074

Adjacent sequences: A239648 A239649 A239650 * A239652 A239653 A239654

Keyword

nonn

Author

R. H. Hardin, Mar 23 2014

Status

approved