a(1) = 1; a(n+1) = Sum_{k=1..n} (a(k)-th integer from among those positive integers which are coprime to (n+1-k)).

A130802

a(1) = 1; a(n+1) = Sum_{k=1..n} (a(k)-th integer from among those positive integers which are coprime to (n+1-k)).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =20a(6) =47a(7) =110a(8) =260a(9) =614a(10) =1448a(11) =3421a(12) =8081a(13) =19092a(14) =45107a(15) =106567a(16) =251768a(17) =594816a(18) =1405285a(19) =3320066a(20) =7843851a(21) =18531547a(22) =43781846a(23) =103437135a(24) =244376187a(25) =577352823a(26) =1364029309a(27) =3222597827a(28) =7613573030a(29) =17987504932

External references