|
%I #5 Mar 31 2012 12:37:32
%S 112,78628,688122928,75244563204398,102755730987812117952,
%T 1752648993312488853687634462,373366766716480043025684339650029800,
%U 993411552731407131616878668696108769698390398
%N Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference
%C Diagonal of A210300
%e Some solutions for n=4
%e ..2..1..0..3..3....3..2..2..1..1....1..1..3..3..0....1..2..0..2..2
%e ..3..3..3..2..1....3..2..0..1..0....3..1..1..3..2....1..0..3..2..3
%e ..3..1..3..0..0....3..3..1..3..2....1..1..2..0..3....0..2..3..3..0
%e ..1..0..2..0..1....2..1..1..2..2....2..3..3..0..0....1..2..3..2..3
%e ..0..2..1..1..1....0..1..3..1..3....2..1..3..2..0....1..1..1..3..3
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 19 2012
| 