%I #12 Sep 13 2022 09:31:28
%S 4,7,4,7,10,7,4,7,4,10,13,10,4,7,4,7,10,7,4,7,4,13,16,13,4,7,4,7,10,7,
%T 4,7,4,10,13,10,4,7,4,7,10,7,4,7,4,16,19,16,4,7,4,7,10,7,4,7,4,10,13,
%U 10,4,7,4,7,10,7,4,7,4,13,16,13,4,7,4,7,10,7,4,7,4,10,13,10,4,7,4,7,10
%N A hierarchical sequence (W3{2,2}*c - see A059126).
%H Jonas Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%F a(n) = A059131(3*n) + A059131(3*n+1) + A059131(3*n+2). - _Sean A. Irvine_, Sep 13 2022
%Y Cf. A001511, A059126, A059131, A059144, A059145.
%K easy,nonn
%O 0,1
%A _Jonas Wallgren_, Jan 19 2001