First differences of A007952.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =2a(5) =6a(6) =4a(7) =8a(8) =4a(9) =8a(10) =6a(11) =10a(12) =2a(13) =18a(14) =4a(15) =20a(16) =6a(17) =10a(18) =14a(19) =18a(20) =4a(21) =20a(22) =18a(23) =18a(24) =4a(25) =26a(26) =18a(27) =16a(28) =8a(29) =40