a(n) = (1/2)*(A005258(n) + A005258(n-1)).

A352655

a(n) = (1/2)*(A005258(n) + A005258(n-1)).

Terms

    a(0) =2a(1) =11a(2) =83a(3) =699a(4) =6252a(5) =58106a(6) =554633a(7) =5399099a(8) =53356322a(9) =533627511a(10) =5388927513a(11) =54859837434a(12) =562267554552

External references