|
%I #7 Sep 07 2022 16:11:26
%S 1,372,142108,24278164,3216740482,482229769194,79772073060022,
%T 13081859298444294,2103850173825539982,338559840680298187294,
%U 54816869874330915574505,8891041335795074855285935
%N Number of n X 4 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.
%C Column 4 of A203443.
%H R. H. Hardin, <a href="/A203439/b203439.txt">Table of n, a(n) for n = 1..98</a>
%e Some solutions for n=5
%e ..6..6..0..0....1..6..6..0....1..7..7..7....6..6..0..0....3..6..7..7
%e ..6..6..2..2....2..6..6..6....7..7..1..7....6..6..2..1....7..7..7..7
%e ..7..7..3..2....2..1..0..6....7..0..5..7....3..3..6..6....7..1..2..2
%e ..7..7..4..2....5..5..6..6....7..3..5..7....4..4..6..6....7..0..7..7
%e ..7..7..4..0....5..5..6..6....7..7..7..7....4..4..2..2....7..7..7..7
%Y Cf. A203443.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 01 2012
| 