[seqfan] Padovan sequence

Charles Greathouse charles.greathouse at case.edu
Wed Mar 17 22:21:33 CET 2010

%C A000931 a(n+4)=Sum_{x=1..nth number of Padovan sequence}x [From
Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), 17 Jul 2009]

Can anyone make sense of this?  a(n+4) is not 1 + 2 + ... + a(n), nor
is it a(1) + a(2) + ... + a(n), nor is it a(0) + a(1) + ... + a(n).
But I'm not willing to dismiss it out of hand; maybe there's a good
interpretation out there.

Charles Greathouse
Case Western Reserve University

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