Number of surviving (but not bifurcating) nodes at generation n in the binary tree of persistently squarefree numbers (see A293230).
A293521
Number of surviving (but not bifurcating) nodes at generation n in the binary tree of persistently squarefree numbers (see A293230).
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =3a(5) =2a(6) =5a(7) =9a(8) =8a(9) =11a(10) =15a(11) =24a(12) =30a(13) =42a(14) =51a(15) =76a(16) =94a(17) =126a(18) =158a(19) =217a(20) =298a(21) =403a(22) =539a(23) =731a(24) =970a(25) =1305a(26) =1748a(27) =2322a(28) =3179a(29) =4225
External references
- oeis: A293521