1,1

a(n) = (-1)^(n)*(2*n+1)^2 - a(n-1) for n = 2, 3, .. , with a(1) = -11.

A160480 is the Beta triangle.

A160484 is the third right hand column.

Sequence in context: A015246 A093500 A081438 this_sequence A034309 A006505 A005000

Adjacent sequences: A160480 A160481 A160482 this_sequence A160484 A160485 A160486

easy,sign

Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009