OFFSET
1,3
FORMULA
G.f. of column k (for k > 0): (1/(1 - x)) * Sum_{j>=1} x^(j^k)/(1 - x^(j^k)).
EXAMPLE
Square array begins:
1, 1, 1, 1, 1, 1, ...
4, 3, 2, 2, 2, 2, ...
9, 5, 3, 3, 3, 3, ...
16, 8, 5, 4, 4, 4, ...
25, 10, 6, 5, 5, 5, ...
36, 14, 7, 6, 6, 6, ...
MATHEMATICA
Table[Function[k, Sum[Floor[n/j^k], {j, 1, n}]][i - n], {i, 0, 12}, {n, 1, i}] // Flatten
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Ilya Gutkovskiy, Feb 22 2019
STATUS
approved