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%I #18 Sep 13 2022 09:35:55
%S 18,54,18,90,18,54,18,126,18,54,18,90,18,54,18,162,18,54,18,90,18,54,
%T 18,126,18,54,18,90,18,54,18,198,18,54,18,90,18,54,18,126,18,54,18,90,
%U 18,54,18,162,18,54,18,90,18,54,18,126,18,54,18,90,18,54,18,234,18,54
%N A hierarchical sequence (W3{2,2}cc - see A059126).
%H Jonas Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%F a(n) = 18*A037227(n). - _Mitch Harris_, Jun 29 2005
%F a(n) = A059136(3*n) + A059136(3*n+1) + A059136(3*n+2). - _Sean A. Irvine_, Sep 13 2022
%Y Cf. A037227, A059126, A059136.
%K easy,nonn
%O 0,1
%A _Jonas Wallgren_, Jan 19 2001
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