Number of ways of writing n=a+b where |s(a)-a|=|s(b)-b|, s(x)=sigma(x)-x.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =0a(7) =1a(8) =1a(9) =2a(10) =0a(11) =2a(12) =1a(13) =1a(14) =0a(15) =1a(16) =2a(17) =2a(18) =1a(19) =2a(20) =0a(21) =2a(22) =1a(23) =2a(24) =0a(25) =2a(26) =0a(27) =1a(28) =0a(29) =2