[seqfan] Problem reproducing A103750 (forth order linear recurrence)

Richard Mathar mathar at strw.leidenuniv.nl
Sat Jul 31 17:02:43 CEST 2010

Can someone with Mma reproduce http://www.oeis.org/classic/A103750 ?
According to the formula this should be the absolute terms of a
4th order linear recurrence a(n)=a(n-1)-a(n-3)+2*a(n-4).
I cannot reproduce this from any starting configuration (1,1,1,2),
(-1,1,1,2), (1,-1,1,2), (1,1,-1,2), (-1,-1,1,2) etc  of the a(0) to a(3).

In addition: what is the sense of referencing A073058 in A103750?

In contrast, A103749 is consistent with the 3rd order recurrence provided there.


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