login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors
1

%I #5 Mar 31 2012 12:37:22

%S 715,7594479,84091222866,931104734002155,10309684155118737894,

%T 114154269785454920027391,1263976383376771173195964686,

%U 13995414281804368959953485044237,154964620775524737157861783733965485

%N Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors

%C Column 7 of A208175

%H R. H. Hardin, <a href="/A208174/b208174.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 24 2012