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A274724 Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2. 1

%I #4 Jul 03 2016 19:59:51

%S 14,96,296,1632,9308,52912,301784,1721528,9816048,55981988,319253288,

%T 1820657976,10382921956,59212245524,337678318592,1925727939552,

%U 10982131736244,62629418453640,357165995693576,2036863060347232

%N Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2.

%C Column 4 of A274728.

%H R. H. Hardin, <a href="/A274724/b274724.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 3*a(n-1) +13*a(n-2) +14*a(n-3) +4*a(n-4) -28*a(n-5) -13*a(n-6) -7*a(n-7) +15*a(n-8) for n>12

%e Some solutions for n=4

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

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

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

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

%Y Cf. A274728.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jul 03 2016

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)