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Search: id:A124502
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| A124502 |
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See Maple code for recurrence. |
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+0
2
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| 1, 1, 2, 3, 5, 9, 14, 23, 37, 60, 98, 158, 256, 414, 670, 1085, 1755, 2840, 4595, 7435, 12031, 19466, 31497, 50963, 82460, 133424, 215884, 349308, 565192, 914500, 1479693, 2394193, 3873886, 6268079, 10141965, 16410045, 26552010, 42962055, 69514065, 112476120
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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O.g.f.: x/((1-x)(x^4+x^3+x^2+x+1)(1-x-x^2)) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 30 2008
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MAPLE
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f:=proc(n) option remember; local t1; if n <= 2 then RETURN(1); fi: if n mod 5 = 1 then t1:=1 else t1:=0; fi: f(n-1)+f(n-2)+t1; end; [seq(f(n), n=1..100)]; - njas, May 25 2008
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CROSSREFS
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Cf. A052952, A004695, A080239, A131132.
Sequence in context: A076027 A056686 A079962 this_sequence A026746 A004699 A018155
Adjacent sequences: A124499 A124500 A124501 this_sequence A124503 A124504 A124505
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KEYWORD
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nonn
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AUTHOR
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njas, May 25 2008
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EXTENSIONS
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Typo in Maple code corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 30 2008
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