OFFSET
1,6
LINKS
V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
N. J. A. Sloane, May 23 2000
EXTENSIONS
Terms a(11)-a(16) appended, journal link changed to article link, and second formula included, by Jason Kimberley, Oct 24 2009
a(17)-a(24) from Andrew Howroyd, May 19 2020
STATUS
approved