Similar to A072921 but starting with 4.

Terms

a(0) =4a(1) =8a(2) =20a(3) =34a(4) =55a(5) =86a(6) =131a(7) =181a(8) =241a(9) =308a(10) =386a(11) =481a(12) =589a(13) =719a(14) =866a(15) =1033a(16) =1207a(17) =1391a(18) =1589a(19) =1810a(20) =2041a(21) =2279a(22) =2537a(23) =2812a(24) =3100a(25) =3392a(26) =3701a(27) =4021a(28) =4348a(29) =4694