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Search: id:A083066
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| 1, 5, 29, 173, 1037, 6221, 37325, 223949, 1343693, 8062157, 48372941, 290237645, 1741425869, 10448555213, 62691331277, 376147987661, 2256887925965, 13541327555789, 81247965334733, 487487792008397, 2924926752050381
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OFFSET
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0,2
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FORMULA
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a(n)=(4*6^n+1)/5 G.f. (1-2x)/((1-6x)(1-x)) E.g.f. (4*exp(6x)+exp(x))/5
a(n)=6*a(n-1)-1 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 29 2009]
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EXAMPLE
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For n=2, a(2)=6*1-1=5; n=3, a(3)=6*5-1=29; n=4, a(4)=6*29-1=173 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 29 2009]
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CROSSREFS
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Cf. A083065, A083067.
Sequence in context: A122370 A088349 A137625 this_sequence A163611 A160906 A163073
Adjacent sequences: A083063 A083064 A083065 this_sequence A083067 A083068 A083069
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KEYWORD
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easy,nonn,new
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Apr 21 2003
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