0,4

The signed version (-1)^(n+1)*n*Pell(n-2) is the second inverse binomial transform of A093967.

G.f.: x(1-4x+5x^2)/(1-2x-x^2)^2; a(n)=n(1+sqrt(2))^n(3sqrt(2)/4-1)-n(1-sqrt(2))^n(3sqrt(2)/4+1).

Cf. A000129.

Sequence in context: A093900 A018789 A141799 this_sequence A006177 A148788 A022553

Adjacent sequences: A093966 A093967 A093968 this_sequence A093970 A093971 A093972

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Apr 21 2004