Floor-Sqrt transform of idempotent endomap numbers (A000248).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =14a(6) =32a(7) =79a(8) =203a(9) =541a(10) =1495a(11) =4267a(12) =12543a(13) =37902a(14) =117519a(15) =373236a(16) =1212418a(17) =4023007a(18) =13619993a(19) =46998318a(20) =165144243a(21) =590411905a(22) =2145978422a(23) =7924484313a(24) =29710783080a(25) =113031311232a(26) =436102652463