a(n) = |A001349(n) - A004251(n)|.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =10a(6) =10a(7) =511a(8) =9904a(9) =256719a(10) =11700555a(11) =1006641217a(12) =164059608359