0,2

Diagonal sums of A039598. a(n)=A000957(n+3).

a(n)=(1+sum{k=0..n+2, C(k)(-2)^k})/(8(-2)^n)

Cf. A064310.

Sequence in context: A125306 A064310 A126983 this_sequence A000957 A125305 A148458

Adjacent sequences: A104626 A104627 A104628 this_sequence A104630 A104631 A104632

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Mar 17 2005