The main entry for this relation is the bisection in A146968.
Table of n, a(n) for n=1..6.
71^2 = 7!+1, which introduces (71,7) into the sequence.
Sequence in context: A309545 A285105 A089520 * A051552 A165367 A166549
Adjacent sequences: A163521 A163522 A163523 * A163525 A163526 A163527
Vincenzo Librandi, Jul 30 2009
Reference to main sequence added by R. J. Mathar, Aug 02 2009