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A208008 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 1 vertically. 1

%I #9 Jan 02 2024 00:36:55

%S 2,16,90,841,5952,43264,393049,4084441,32673396,334012176,3665311664,

%T 37536737536,385814058880,4801282939489,53629177761313,

%U 628423124320161,7905277739708518,101862335149216849,1250237739999352500

%N Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 1 vertically.

%C Diagonal of A208013.

%H R. H. Hardin, <a href="/A208008/b208008.txt">Table of n, a(n) for n = 1..25</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A208013.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 22 2012

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Last modified July 23 18:56 EDT 2024. Contains 374553 sequences. (Running on oeis4.)