Number of coprime chains with largest member prime(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =9a(5) =10a(6) =19a(7) =20a(8) =32a(9) =84a(10) =85a(11) =161a(12) =212a(13) =214a(14) =260a(15) =521a(16) =818a(17) =820a(18) =1189a(19) =1406a(20) =1415a(21) =2005a(22) =2375a(23) =3351a(24) =5698a(25) =6122a(26) =6141a(27) =6600a(28) =6623a(29) =7270