OFFSET
1,1
COMMENTS
To calculate a(n) consider that levels greater than n do not exist.
LINKS
EXAMPLE
For n = 1 the first level of the stepped pyramid (starting from the top) is a cube, and a cube has 12 edges, so a(1) = 12.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Apr 16 2019
STATUS
approved