OFFSET
1,3
LINKS
Seiichi Manyama, Antidiagonals n = 1..140, flattened
FORMULA
L.g.f. of column k: -log(Product_{j>=1} (1 - j*x^j)^(j^(k-1))).
EXAMPLE
Square array begins:
1, 1, 1, 1, 1, 1, ...
3, 5, 9, 17, 33, 65, ...
4, 10, 28, 82, 244, 730, ...
9, 25, 81, 289, 1089, 4225, ...
6, 26, 126, 626, 3126, 15626, ...
24, 80, 330, 1604, 8634, 49100, ...
MATHEMATICA
T[n_, k_] := DivisorSum[n, #^(n/# + k) &]; Table[T[k, n - k], {n, 1, 11}, {k, 1, n}] // Flatten (* Amiram Eldar, May 11 2021 *)
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Seiichi Manyama, Jun 02 2019
STATUS
approved