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Search: id:A141479
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| 2, 3, 3, 3, 6, 18, 63, 273, 1386, 7938, 50523, 353793, 2702766, 22368258, 199360983, 1903757313, 19391512146, 209865342978, 2404879675443, 29088885112833, 370371188237526, 4951498053124098, 69348874393137903, 1015423886506852353
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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a(n) is a multiple of 3 for n > 0.
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MAPLE
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A000111 := proc(n) local x; n!*coeftayl( sec(x)+tan(x), x=0, n) ; end: A014695 := proc(n) local x; coeftayl( (1+2*x+2*x^2+x^3)/(1-x^4), x=0, n) ; end: A141479 := proc(n) A000111(n)+A014695(n) ; end: for n from 0 to 30 do printf("%a, ", A141479(n)) ; od; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 12 2008]
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CROSSREFS
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Sequence in context: A093653 A049982 A070167 this_sequence A055081 A109833 A132005
Adjacent sequences: A141476 A141477 A141478 this_sequence A141480 A141481 A141482
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Aug 09 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 12 2008
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