a(n) = floor(sqrt{concatenation n,(n-1),...,3,2,1}).

A095252

a(n) = floor(sqrt{concatenation n,(n-1),...,3,2,1}).

Terms

    a(0) =1a(1) =4a(2) =17a(3) =65a(4) =233a(5) =808a(6) =2766a(7) =9362a(8) =31426a(9) =104822a(10) =1054033a(11) =11005043a(12) =114547418a(13) =1188747707a(14) =12305003905a(15) =127088210000

External references