Quarter-squares plus 1 (that is, a(n) = A002620(n) + 1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =10a(7) =13a(8) =17a(9) =21a(10) =26a(11) =31a(12) =37a(13) =43a(14) =50a(15) =57a(16) =65a(17) =73a(18) =82a(19) =91a(20) =101a(21) =111a(22) =122a(23) =133a(24) =145a(25) =157a(26) =170a(27) =183a(28) =197a(29) =211