a(1)=1. a(n+1) = sum{k=1 to n} (a(k)th integer from among those positive integers which are coprime to a(n+1-k)).
A132275
a(1)=1. a(n+1) = sum{k=1 to n} (a(k)th integer from among those positive integers which are coprime to a(n+1-k)).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =17a(6) =37a(7) =81a(8) =177a(9) =387a(10) =847a(11) =1856a(12) =4066a(13) =8910a(14) =19524a(15) =42783a(16) =93760a(17) =205475a(18) =450282a(19) =986770a(20) =2162473a(21) =4738974a(22) =10385267a(23) =22758885a(24) =49875175a(25) =109299427a(26) =239525260a(27) =524909877a(28) =1150318695a(29) =2520876742
External references
- oeis: A132275