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A239407 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4 1
12, 129, 1337, 13977, 144762, 1504399, 15591122, 161801518, 1677624003, 17403195529, 180479056305, 1871997954119, 19414915574725, 201369918597195, 2088509247416759, 21661501410101827, 224664541142404827 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A239405

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=4

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

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

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

CROSSREFS

Sequence in context: A173359 A199037 A099157 * A163414 A111777 A209013

Adjacent sequences:  A239404 A239405 A239406 * A239408 A239409 A239410

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 17 2014

STATUS

approved

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Last modified April 4 23:59 EDT 2020. Contains 333238 sequences. (Running on oeis4.)