0,2

a(n) = A007583(n+1)-2 = A020988(n)-1 = A039301(n+2)-3. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Jun 14 2003

a(n)=(8*4^n-5)/3. G.f.: (1+4x)/((1-x)(1-4x)). E.g.f.: (8exp(4x)-exp(x))/3.

Cf. A083855.

Sequence in context: A001846 A034441 A056243 this_sequence A083085 A129793 A050635

Adjacent sequences: A083581 A083582 A083583 this_sequence A083585 A083586 A083587

easy,nonn

Paul Barry (pbarry(AT)wit.ie), May 01 2003