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Search: id:A144707
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| 1, 1, 2, 7, 11, 22, 35, 61, 98, 163, 263, 430, 695, 1129, 1826, 2959, 4787, 7750, 12539, 20293, 32834, 53131, 85967, 139102, 225071, 364177, 589250, 953431, 1542683, 2496118, 4038803, 6534925, 10573730, 17108659, 27682391
(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.: (1-x^2+4x^3+2x^4)/((1-x^2)(1-x-x^2)); a(n)=3*F(n+1)-3-(-1)^n+2*0^n;
a(n)=a(n-1)+2*a(n-2)-a(n-3)-a(n-4), n>4 ; a(0)=1, a(1)=1, a(2)=2, a(3)=7, a(4)=11 . [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 16 2008]
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CROSSREFS
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Sequence in context: A141183 A103182 A160698 this_sequence A045373 A075431 A045374
Adjacent sequences: A144704 A144705 A144706 this_sequence A144708 A144709 A144710
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Sep 19 2008
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