A172298 a(n) = A027641(n) * A164555(n).

1, -1, 1, 0, 1, 0, 1, 0, 1, 0, 25, 0, 477481, 0, 49, 0, 13082689, 0, 1924313689, 0, 30489001321, 0, 730192467169, 0, 55867983514256281, 0, 73155570928609, 0, 564036899167989738841, 0, 74232720893311466588760025, 0, 59433630916551169012841089, 0, 6644474695172651051906689

Offset: 0

Author

Paul Curtz, Jan 31 2010

Keywords

• sign

Comments

Squares of Bernoulli number numerators (apart from the sign flipped at a(1)).

The associated denominators of the squared Bernoulli numbers are in A172282.

Crossrefs

Cf. A027641, A164555, A172282.

Extensions

Edited and extended by R. J. Mathar, Feb 02 2010