OFFSET
1,2
FORMULA
a(n) = decimal concatenation of n,a(n-1),a(n-2),...,a(1).
EXAMPLE
a(3) = 3211 because a(2) = 21 and a(1)=1 then 3 concatenate a(2) and a(1).
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Eder Vanzei, Sep 10 2019
STATUS
approved