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A239399 Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it, modulo 4 1
4, 23, 129, 698, 3805, 20818, 113774, 621754, 3399032, 18582965, 101593258, 555419633, 3036563927, 16601366841, 90762262155, 496211843813, 2712870511114, 14831702705726, 81087325012785, 443317575022163, 2423689199017701 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A239405

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -28*a(n-2) +74*a(n-3) -181*a(n-4) +236*a(n-5) -261*a(n-6) +234*a(n-7) +200*a(n-8) -279*a(n-9) +104*a(n-10) -268*a(n-11) -36*a(n-12) +156*a(n-13) +104*a(n-14) -32*a(n-15) -16*a(n-16)

EXAMPLE

Some solutions for n=5

..3..1....0..0....0..3....0..0....3..3....3..3....3..3....3..1....3..1....0..0

..0..0....3..1....3..3....0..3....3..3....0..0....3..3....0..2....0..2....0..0

..2..2....2..2....3..2....0..2....3..2....2..0....2..2....0..2....0..2....0..0

..2..0....2..2....3..1....0..2....0..3....0..3....3..1....2..0....0..0....3..3

..3..2....3..1....2..0....0..0....2..0....0..2....3..1....0..0....0..2....0..0

CROSSREFS

Sequence in context: A236421 A227639 A291026 * A193808 A038723 A302761

Adjacent sequences:  A239396 A239397 A239398 * A239400 A239401 A239402

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 17 2014

STATUS

approved

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)