OFFSET
1,1
COMMENTS
Sequence is 4 + 6 + 8 + 10 + 12 + 14 + ... + n.
6*10^n-2 for n >=0 are terms. - Chai Wah Wu, Feb 20 2021
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..40
P. De Geest, Palindromic Sums
FORMULA
a(n) = 2*(1+A028553(1+n)). - R. J. Mathar, Sep 09 2015
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Dec 15 2000
STATUS
approved