a(n) = sum of the numbers between the two n's in A026284.

Terms

a(0) =14a(1) =19a(2) =25a(3) =32a(4) =40a(5) =59a(6) =81a(7) =106a(8) =134a(9) =165a(10) =184a(11) =220a(12) =242a(13) =283a(14) =308a(15) =354a(16) =382a(17) =433a(18) =464a(19) =520a(20) =579a(21) =615a(22) =679a(23) =746a(24) =787a(25) =859a(26) =934a(27) =980a(28) =1060a(29) =1143