(L)-sieve transform of {1,4,7,10,...,3n-2,...} (A016777).

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =16a(5) =25a(6) =39a(7) =60a(8) =91a(9) =138a(10) =208a(11) =313a(12) =471a(13) =708a(14) =1063a(15) =1596a(16) =2395a(17) =3594a(18) =5392a(19) =8089a(20) =12135a(21) =18204a(22) =27307a(23) =40962a(24) =61444a(25) =92167