0,2

Partial sums of A097167. a(n)=A097169(2n+1)/4.

a(n)=10*10^n/3-9*9^n/4-1/12; a(n)=20a(n-1)-109a(n-2)+90a(n-3).

Sequence in context: A090667 A125448 A051475 this_sequence A108366 A077416 A102146

Adjacent sequences: A097165 A097166 A097167 this_sequence A097169 A097170 A097171

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jul 30 2004