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a(n) = T(n,4), array T as in A049615.
0

%I #7 Aug 05 2021 20:01:44

%S 3,3,6,8,11,12,16,17,20,22,25,26,30,31,34,36,39,40,44,45,48,50,53,54,

%T 58,59,62,64,67,68,72,73,76,78,81,82,86,87,90,92,95,96,100,101,104,

%U 106,109,110,114,115,118,120,123,124,128,129,132,134,137,138,142

%N a(n) = T(n,4), array T as in A049615.

%K nonn

%O 0,1

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Aug 05 2021