A240297 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 or two plus the sum of the elements diagonally to its northwest, modulo 4

4, 24, 206, 1322, 9970, 63892, 459420, 2983714, 21011004, 138067258, 960196414, 6366988610, 43918588986, 293115852448, 2010639717594, 13480363485774, 92114886446716, 619546400267578, 4222299248961016, 28460962259793426

Offset

1,1

Comments

Row 3 of A240295

Links

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

R. H. Hardin, Empirical recurrence of order 80

Formula

Empirical recurrence of order 80 (see link above)

Example

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

Crossrefs

Sequence in context: A012244 A342168 A240429 * A050388 A241980 A368267

Adjacent sequences: A240294 A240295 A240296 * A240298 A240299 A240300

Keyword

nonn

Author

R. H. Hardin, Apr 03 2014

Status

approved