Third differences of A037260.

Terms

a(0) =7a(1) =8a(2) =10a(3) =12a(4) =13a(5) =14a(6) =15a(7) =16a(8) =18a(9) =20a(10) =21a(11) =22a(12) =23a(13) =24a(14) =25a(15) =27a(16) =28a(17) =30a(18) =31a(19) =32a(20) =33a(21) =34a(22) =35a(23) =37a(24) =38a(25) =39a(26) =40a(27) =42a(28) =43a(29) =44