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Search: id:A162845
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| A162845 |
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Sum of digits of binomial(3n,n) |
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+0
1
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| 1, 3, 6, 12, 18, 6, 24, 18, 27, 39, 18, 36, 36, 36, 42, 60, 63, 63, 78, 72, 72, 63, 72, 90, 72, 99, 90, 75, 117, 108, 90, 99, 117, 117, 99, 162, 126, 144, 153, 153, 153, 159, 150, 126, 153, 114, 144, 171, 171, 171, 162, 162, 198, 180, 186, 207, 180, 189, 180, 234, 207
(list; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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a(4)=sum of digits of binomial(3*4,4)=18 because binomial(3*4,4)=495
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MAPLE
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a := proc (n) local nn: nn := convert(binomial(3*n, n), base, 10): add(nn[j], j = 1 .. nops(nn)) end proc: seq(a(n), n = 0 .. 70); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 29 2009]
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CROSSREFS
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Sequence in context: A108757 A146952 A038046 this_sequence A038588 A111041 A079830
Adjacent sequences: A162842 A162843 A162844 this_sequence A162846 A162847 A162848
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KEYWORD
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nonn,base
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AUTHOR
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Yalcin Aktar (aktaryalcin(AT)gmail.com), Jul 14 2009
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 29 2009
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