0,3

a(n)=(A084058(n)+1)/2.

a(n)=(1+sqrt(8))^n/4+(1-sqrt(8))^n/4+1/2; E.g.f.: exp(x)cosh(sqrt(2)x)^2

Cf. A084137.

Sequence in context: A149550 A149551 A149552 this_sequence A091147 A149553 A149554

Adjacent sequences: A084133 A084134 A084135 this_sequence A084137 A084138 A084139

easy,nonn

Paul Barry (pbarry(AT)wit.ie), May 16 2003