Rectangular numbers.

Terms

a(0) =2a(1) =5a(2) =6a(3) =10a(4) =12a(5) =13a(6) =14a(7) =17a(8) =18a(9) =20a(10) =21a(11) =22a(12) =26a(13) =28a(14) =29a(15) =30a(16) =33a(17) =34a(18) =37a(19) =38a(20) =39a(21) =41a(22) =42a(23) =44a(24) =45a(25) =46a(26) =50a(27) =52a(28) =53a(29) =54