A218636 - OEIS

%I #4 Nov 03 2012 18:58:23

%S 57,4065,262017,16773477,1073471633,68702054721,4396930705721,

%T 281403528942981,18009823835462025,1152628595873880165,

%U 73768221838169850821,4721165666554240664629,302154568669832438214889

%N Hilltop maps: number of nX6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nX6 array

%C Column 6 of A218638

%H R. H. Hardin, <a href="/A218636/b218636.txt">Table of n, a(n) for n = 1..74</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 03 2012