A240296 Number of 2Xn 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 or two plus the sum of the elements diagonally to its northwest, modulo 4

2, 6, 26, 90, 340, 1194, 4424, 15766, 57754, 207500, 755822, 2726558, 9903504, 35798370, 129844290, 469823642, 1702892772, 6164774336, 22336556588, 80882514452, 293006418302, 1061132591102, 3843739599044, 13921096670132

Offset

1,1

Comments

Row 2 of A240295

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +9*a(n-2) -23*a(n-3) -15*a(n-4) +30*a(n-5) +20*a(n-6) +7*a(n-7) -30*a(n-8) +a(n-9) +23*a(n-10) -8*a(n-11) -8*a(n-12)

Example

Some solutions for n=4
..1..3..1..3....3..1..1..0....3..0..1..1....3..1..3..1....1..3..3..0
..1..0..0..0....3..0..0..1....3..0..1..2....3..0..2..2....1..2..2..3

Crossrefs

Sequence in context: A213339 A317867 A092438 * A027207 A027231 A083845

Adjacent sequences: A240293 A240294 A240295 * A240297 A240298 A240299

Keyword

nonn

Author

R. H. Hardin, Apr 03 2014

Status

approved