OFFSET
2,1
COMMENTS
LINKS
Alois P. Heinz, Table of n, a(n) for n = 2..2017
EXAMPLE
Triangle T(n,m) begins:
4,
36, 9,
144, 16, 16,
400, 225, 100, 25,
900, 144, 12, 9, 36,
1764, 1225, 784, 441, 196, 49,
3136, 576, 1600, 64, 576, 64, 64,
MAPLE
A174413 := proc(n, m) 1/(n-m)^2-1/n^2 ; denom(%) ; end proc:
seq(seq(A174413(n, k), k=1..n-1), n=2..11); # R. J. Mathar, Jan 27 2011
MATHEMATICA
T[n_, m_] := Denominator[1/(n - m)^2 - 1/n^2];
Table[T[n, m], {n, 2, 11}, {m, 1, n-1}] // Flatten (* Jean-François Alcover, May 18 2018 *)
CROSSREFS
AUTHOR
Paul Curtz, Mar 19 2010
STATUS
approved