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A hierarchical sequence (W3{2,2}cc - see A059126).
2

%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