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A269034 Number of nX7 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1

%I

%S 576,6912,198816,4998648,119790816,2783857776,63310818360,

%T 1416701634552,31304407671636,684763778434512,14854833017622684,

%U 320017408314705960,6853471478780510820,146027732878366085832,3097663460112852295020

%N Number of nX7 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

%C Column 7 of A269035.

%H R. H. Hardin, <a href="/A269034/b269034.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 82*a(n-1) -2779*a(n-2) +50254*a(n-3) -514677*a(n-4) +2743554*a(n-5) -2950648*a(n-6) -48609034*a(n-7) +245316224*a(n-8) -89432156*a(n-9) -2444502643*a(n-10) +5704858072*a(n-11) +7254972423*a(n-12) -41716035658*a(n-13) +18035762825*a(n-14) +132606292618*a(n-15) -178302990168*a(n-16) -171928095488*a(n-17) +491624257303*a(n-18) -70904009836*a(n-19) -621985038704*a(n-20) +477824279660*a(n-21) +281672875548*a(n-22) -522707244404*a(n-23) +119050620101*a(n-24) +190519380818*a(n-25) -140300285301*a(n-26) +10246766686*a(n-27) +24709126330*a(n-28) -9478840252*a(n-29) -368991021*a(n-30) +964165580*a(n-31) -172681320*a(n-32) -20355920*a(n-33) +9906636*a(n-34) -719568*a(n-35) -120720*a(n-36) +22272*a(n-37) -1024*a(n-38) for n>39

%e Some solutions for n=3

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

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

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

%Y Cf. A269035.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 18 2016

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Last modified July 16 09:13 EDT 2020. Contains 335784 sequences. (Running on oeis4.)