a(n) = sum of the numbers between the two n's in A026366.

Terms

a(0) =2a(1) =8a(2) =32a(3) =50a(4) =97a(5) =127a(6) =161a(7) =199a(8) =285a(9) =335a(10) =444a(11) =506a(12) =572a(13) =642a(14) =790a(15) =872a(16) =1043a(17) =1137a(18) =1331a(19) =1437a(20) =1654a(21) =1772a(22) =1894a(23) =2020a(24) =2276a(25) =2414a(26) =2693a(27) =2843a(28) =2997a(29) =3155