1,1
G.f.: 6x(1+5x)/((1-x)(1+x)). a(n)=6*A010686(n-1). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 27 2009]
a(n)=18+12(-1)^n, with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Sep 28 2009]
Cf. A124886, A002445, A040214.
Sequence in context: A143563 A122802 A051685 this_sequence A123624 A066197 A078638
Adjacent sequences: A165731 A165732 A165733 this_sequence A165735 A165736 A165737
nonn
Paul Curtz (bpcrtz(AT)free.fr), Sep 25 2009
Edited by N. J. A. Sloane, Sep 25 2009
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