[seqfan] Sorting out incorrect versions of sequences
charles.greathouse at case.edu
Wed Nov 11 23:38:00 CET 2009
A161563 is described as "Triple factorials n!!!" and begins
1, 1, 2, 6, 40320, 1307674368000, ...
The Math'ca code it gives is n!!!, which is parsed as (n!!)!. So a(5)
= (5!!)! = 15! = 1307674368000.
Should I mark this as an erroneous version of A007661, or should I
change the definition to "Factorials of double factorials"? This
seems to have implications for many of the unedited sequences so I
thought I'd ask here.
Case Western Reserve University
More information about the SeqFan