0,4

Row sums of A152290 at q=-1: a(n) = Sum_{k=0..n(n-1)/2} A152290(n,k)*(-1)^k.

(PARI) a(n)=(n+1)^floor((n-1)/2)

Cf. A152290, A000272.

Sequence in context: A041907 A151450 A131139 this_sequence A041557 A123304 A041037

Adjacent sequences: A152288 A152289 A152290 this_sequence A152292 A152293 A152294

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2008