OFFSET
0,1
COMMENTS
a(n) > 2*10^14 for n >= 19. [Donovan Johnson, Dec 13 2008]
a(19) <= 4143680790926400 = 64*a(18). [Jon E. Schoenfield, Aug 11 2010]
EXAMPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
David W. Wilson, May 04 2001
EXTENSIONS
a(14) and a(16)-a(18) from Donovan Johnson, Dec 13 2008
a(0) and examples from Reinhard Zumkeller, Jul 17 2010
STATUS
approved