A172299 First differences of A172298.

-2, 2, -1, 1, -1, 1, -1, 1, -1, 25, -25, 477481, -477481, 49, -49, 13082689, -13082689, 1924313689, -1924313689, 30489001321, -30489001321, 730192467169, -730192467169, 55867983514256281, -55867983514256281, 73155570928609, -73155570928609

Offset: 0

Author

Paul Curtz, Jan 31 2010

Keywords

• sign

Comments

Differences between squares of Bernoulli number denominators.

Formula

a(n) = A172298(n+1)-A172298(n).

a(2n) = -a(2n-1), n>=2 .

Extensions

Keyword:sign added, sequence extended by R. J. Mathar, Feb 02 2010