Number of pairs of adjacent equal parts in all complete compositions of n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =12a(6) =23a(7) =54a(8) =118a(9) =258a(10) =550a(11) =1178a(12) =2540a(13) =5394a(14) =11473a(15) =24174a(16) =51021a(17) =107210a(18) =225099a(19) =471322a(20) =985202a(21) =2055542a(22) =4281847a(23) =8906676a(24) =18500425a(25) =38379246a(26) =79516158a(27) =164561560a(28) =340179441a(29) =702506576