OFFSET
1,3
EXAMPLE
Rows with power sets of divisors of n (without nonempty sets):
{1};
{1}, {2}, {1, 2};
{1}, {3}, {1, 3};
{1}, {2}, {4}, {1, 2}, {1, 4}, {2, 4}, {1, 2, 4};
{1}, {5}, {1, 5};
...
Concatenation: 1, 1, 2, 1, 2, 1, 3, 1, 3, ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Feb 24 2017
STATUS
approved