0,2

a(n)=(1+(-1)^n)8^floor((n+1)/2)/2+3(1-(-1)^n)8^floor(n/2)/2; a(n)=2^(3n/2)(3sqrt(2)/8+1/2-(3sqrt(2)/8-1/2)(-1)^n). a(2n+1)=2a(2n)+2a(2n-1)+2a(2n-2); a(2n)=2a(2n-1)+2a(2n-2).

Cf. A038754.

Sequence in context: A026556 A096001 A080097 this_sequence A056332 A091588 A018046

Adjacent sequences: A096883 A096884 A096885 this_sequence A096887 A096888 A096889

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jul 14 2004