Position of n^2 + 5 in A000408.

Terms

a(0) =2a(1) =3a(2) =6a(3) =10a(4) =16a(5) =22a(6) =33a(7) =43a(8) =56a(9) =70a(10) =87a(11) =104a(12) =124a(13) =146a(14) =170a(15) =193a(16) =221a(17) =249a(18) =280a(19) =311a(20) =345a(21) =380a(22) =416a(23) =455a(24) =495a(25) =536a(26) =581a(27) =627a(28) =674a(29) =722