OFFSET
1,2
COMMENTS
Equivalently, numbers k such that in the perspective view of the stepped pyramid described in A245092, the steps of the n-th level do not share any vertical face with the steps of the level n + 1, starting from the top of the pyramid.
a(2) = 2 is the only even number in the sequence.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Apr 02 2019
STATUS
approved