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Number of patterns with perimeter n in the planar net 3.3.4.3.4, mirrors and holes are excluded.
1

%I #10 Nov 17 2015 21:11:22

%S 0,0,1,2,1,3,6,13

%N Number of patterns with perimeter n in the planar net 3.3.4.3.4, mirrors and holes are excluded.

%C Inspired by A057729 which is in planar net 3.3.3.3.3.3.

%H Kival Ngaokrajang, <a href="/A260666/a260666.pdf">Illustration of initial terms</a>

%Y Cf. A057729.

%K nonn,more

%O 1,4

%A _Kival Ngaokrajang_, Nov 14 2015