OFFSET
1,5
COMMENTS
Conjecture: indices of zeros give A082662.
a(n) is the total number of steps in all even-indexed double-staircases of the diagram of A196020 with n levels.
a(n) is also the total number of steps in all even-indexed double-staircases of the diagram described in A335616 with n levels that have at least one step in the bottom level of the diagram.
The graph of the sum-of-divisors function A000203 is intermediate between the graph of A353149 and the graph of this sequence (see the Links section). - Omar E. Pol, May 13 2022
LINKS
OEIS Plot 2, A353154 vs A000203
EXAMPLE
For n = 15 the 15th row of the triangle A196020 is [29, 13, 7, 0, 1]. The sum of the even-indexed terms is 13 + 0 = 13, so a(15) = 13.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 27 2022
STATUS
approved