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Number of 0..7 colorings of a 3X(n+1) array circular in the n+1 direction with new values 0..7 introduced in row major order
1

%I #4 Jul 08 2012 07:48:08

%S 34,1067,175884,35910351,8769708263,2254551356877,590331473158067,

%T 155477068701032105,41028544677007946452,10833921344703864397903,

%U 2861400614608678698335420,755792780104880516509618185

%N Number of 0..7 colorings of a 3X(n+1) array circular in the n+1 direction with new values 0..7 introduced in row major order

%C Row 3 of A214238

%H R. H. Hardin, <a href="/A214241/b214241.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 265*a(n-1) +7554*a(n-2) -1867528*a(n-3) -62286057*a(n-4) +2902611121*a(n-5) +125747697424*a(n-6) -732113570102*a(n-7) -67260892111454*a(n-8) -28753862898414*a(n-9) +16985526470239324*a(n-10) +12070258654217672*a(n-11) -2554590879317240826*a(n-12) +2435808355474168314*a(n-13) +237264509331309926184*a(n-14) -768620584759884219588*a(n-15) -12656274586202957694069*a(n-16) +75222969631103645589813*a(n-17) +300273533556710255969314*a(n-18) -3426282900760196815061968*a(n-19) +1862684826195514563217827*a(n-20) +70885929438360326385660853*a(n-21) -229410610506591319332092040*a(n-22) -425685472758512549909477110*a(n-23) +3737448111891699239791610708*a(n-24) -4815222803627645788473735088*a(n-25) -16748767647665181833592963760*a(n-26) +61095743994656339686489703424*a(n-27) -41788255438436976273164042560*a(n-28) -117168547187900314567721804288*a(n-29) +240100016620055726181856792320*a(n-30) -73485025369404006627834739200*a(n-31) -196400767199257030843351277568*a(n-32) +186930489790667567608894439424*a(n-33) -3635545149158889430089400320*a(n-34) -52199287054967923365829017600*a(n-35) +14963130776265241412763648000*a(n-36)

%e Some solutions for n=4

%e ..0..1..0..1..2....0..1..0..1..2....0..1..2..0..2....0..1..0..1..2

%e ..1..0..1..2..3....1..0..1..0..3....1..0..1..2..0....1..2..1..0..3

%e ..0..2..3..4..1....2..1..0..1..4....0..1..0..1..2....2..3..0..4..5

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 08 2012