OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..2000
MATHEMATICA
Accumulate[Nest[Join[#, # Range[Length[#]]]&, {1, 1}, 6]] (* Harvey P. Dale, Aug 10 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Jul 03 2006
EXTENSIONS
Corrected and extended by N. J. A. Sloane, Aug 09 2019 at the suggestion of Harvey P. Dale.
STATUS
approved