cp's OEIS Frontend

A269211 Number of nX5 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

%I A269211 #4 Feb 20 2016 11:27:09
%S A269211 432,49536,4744704,394072704,30541426560,2267772823680,
%T A269211 163535201141376,11544796423498368,801929439109544064,
%U A269211 54999867607734747264,3733606080456064161408,251316480848067823807104
%N A269211 Number of nX5 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.
%C A269211 Column 5 of A269214.
%H A269211 R. H. Hardin, <a href="/A269211/b269211.txt">Table of n, a(n) for n = 1..210</a>
%F A269211 Empirical: a(n) = 156*a(n-1) -8170*a(n-2) +166732*a(n-3) -1381249*a(n-4) +2520764*a(n-5) +23584856*a(n-6) -130579860*a(n-7) +143100280*a(n-8) +633365472*a(n-9) -2425054036*a(n-10) +3486590032*a(n-11) -2082954096*a(n-12) -207585696*a(n-13) +891171072*a(n-14) -335167488*a(n-15) -34112320*a(n-16) +43766784*a(n-17) -8385024*a(n-18) +497664*a(n-19) -9216*a(n-20) for n>21
%e A269211 Some solutions for n=2
%e A269211 ..1..0..0..0..2. .1..3..1..3..0. .0..1..0..1..1. .1..3..0..2..3
%e A269211 ..2..0..0..2..3. .1..0..1..1..3. .3..2..3..0..1. .3..1..3..2..2
%Y A269211 Cf. A269214.
%K A269211 nonn
%O A269211 1,1
%A A269211 _R. H. Hardin_, Feb 20 2016