0,3

G.f.: x(1+x) / [(1-7x+x^2)(1-x)^2 ].

(1/5) [Fibonacci(4n+2) - 2n - 1 ].

Partial sums of A049684. Bisection of A002571 and |A077916|.

Sequence in context: A159687 A044197 A044578 this_sequence A119167 A027778 A026969

Adjacent sequences: A103431 A103432 A103433 this_sequence A103435 A103436 A103437

nonn,easy

Ralf Stephan, Feb 08 2005