A301828 - OEIS

%I #4 Mar 27 2018 10:17:40

%S 0,233,64,1183,19130,147954,2341241,24102055,298497818,3505205058,

%T 41108505612,488703775775,5745894085957,68034532914313,

%U 802101978217021,9479073301967998,111895780368223703,1321526207564475140

%N Number of 7Xn 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.

%C Row 7 of A301823.

%H R. H. Hardin, <a href="/A301828/b301828.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

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

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

%Y Cf. A301823.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 27 2018