OFFSET
1,1
COMMENTS
MATHEMATICA
Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{}, 2n, {1, 4}]], {n, 4}], 1]] (* Harvey P. Dale, Aug 30 2016 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jonathan Vos Post, Jul 19 2012
STATUS
approved