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%I #6 Apr 16 2024 11:48:45
%S 1,1,2,2,3,2,3,3,2,3,2,2,2,2,2,1,1,1,1,2,2,2,3,3,3,4,4,3,4,4,4,5,6,7,
%T 8,9,9,10,9,9,10,9,8,9,8,8,9,9,10,11,11,11,12,12,12,13,13,12,13,13,13,
%U 12,12,13,12,12,12,11,12,12,11,12,11,10,11,11
%N a(n)=(# 1's)-(# 2's) in first n terms of A031253.
%t Accumulate[Which[#==1,1,#==2,-1,True,0]&/@(Table[IntegerDigits[2n-1,5],{n,60}]//Flatten)] (* _Harvey P. Dale_, Apr 16 2024 *)
%K nonn,changed
%O 1,3
%A _Clark Kimberling_
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