OFFSET
1,5
COMMENTS
Also the gcd of the coefficients of the partition polynomials (called 'De Moivre polynomials' by O'Sullivan, see link, Theorem 4.1). - Peter Luschny, Sep 20 2022
LINKS
Indranil Ghosh, Rows 1..120 of triangle, flattened.
Cormac O'Sullivan, De Moivre and Bell polynomials, arXiv:2203.02868 [math.CO], 2022.
FORMULA
Sum of n-th row = A057661(n).
EXAMPLE
From Indranil Ghosh, Feb 14 2017: (Start)
Triangle begins:
1,
1, 1,
1, 2, 1,
1, 1, 3, 1,
1, 2, 3, 4, 1,
1, 1, 1, 2, 5, 1,
1, 2, 3, 4, 5, 6, 1,
. . .
T(4,3) = 3 / gcd(3,4) = 3 / 1 = 3. (End)
MAPLE
seq(seq(k / igcd(n, k), k = 1..n), n = 1..13); # Peter Luschny, Sep 20 2022
MATHEMATICA
Flatten[Table[k/GCD[k, n], {n, 20}, {k, n}]] (* Harvey P. Dale, Jul 21 2013 *)
PROG
(PARI) for(n=0, 10, for(k=1, n, print1(k/gcd(k, n), ", "))) \\ G. C. Greubel, Sep 13 2017
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Reinhard Zumkeller, Aug 12 2009
STATUS
approved