First differences of A140778.

Terms

a(0) =2a(1) =4a(2) =5a(3) =6a(4) =-10a(5) =9a(6) =11a(7) =-15a(8) =14a(9) =16a(10) =-24a(11) =20a(12) =21a(13) =-38a(14) =23a(15) =25a(16) =-44a(17) =29a(18) =30a(19) =-54a(20) =32a(21) =33a(22) =-62a(23) =35a(24) =36a(25) =-68a(26) =40a(27) =41a(28) =-76a(29) =46