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Search: id:A159036
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| A159036 |
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a(0)=0, a(1)=1, a(2)=4, a(3)=13; thereafter a(n+3)=4*a(n+2)-4*a(n+1)+2*a(n) for n>=1. |
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+0
2
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| 0, 1, 4, 13, 38, 108, 306, 868, 2464, 6996, 19864, 56400, 160136, 454672, 1290944, 3665360, 10407008, 29548480, 83896608, 238206528, 676336640, 1920313664, 5452321152, 15480703232, 43954155648, 124798451968, 354338591744, 1006068870400
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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G.f.: f(z)=((z+z^3)/(1-4*z+4*z^2-2*z^3))
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CROSSREFS
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Sequence in context: A084851 A094706 A056014 this_sequence A058693 A027076 A105693
Adjacent sequences: A159033 A159034 A159035 this_sequence A159037 A159038 A159039
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KEYWORD
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easy,nonn
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AUTHOR
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Richard Choulet (richardchoulet(AT)yahoo.fr), Apr 03 2009
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EXTENSIONS
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Definition corrected by Paolo P. Lava (ppl(AT)spl.at), Apr 06 2009
More terms by Vincenzo Librandi (vincenzo.librandi(AT)tin.it) Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jun 30 2009
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