A240048 - OEIS

%I #5 Aug 11 2014 22:46:11

%S 4,10,26,72,174,597,1187,3115,7269,16520,39181,89951,210684,483773,

%T 1131924,2616441,6047969,14112456,32543109,75591535,175328537,

%U 405822918,941534652,2181820138,5057085795,11720944941,27171466826,62973901722

%N Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4

%C Row 3 of A240046

%H R. H. Hardin, <a href="/A240048/b240048.txt">Table of n, a(n) for n = 1..200</a>

%H R. H. Hardin, <a href="/A240048/a240048.txt">Empirical recurrence of order 76</a>

%F Empirical recurrence of order 76 (see link above)

%e Some solutions for n=3

%e ..2..3..2....2..3..3....3..2..2....3..2..2....3..2..2....2..3..2....2..3..3

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 31 2014