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A162845
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Sum of digits of binomial(3n,n)
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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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EXAMPLE
| a(4)=sum of digits of binomial(3*4,4)=18 because binomial(3*4,4)=495
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MAPLE
| 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
| Sequence in context: A108757 A146952 A038046 * A038588 A111041 A079830
Adjacent sequences: A162842 A162843 A162844 * A162846 A162847 A162848
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KEYWORD
| nonn,base
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AUTHOR
| Yalcin Aktar (aktaryalcin(AT)gmail.com), Jul 14 2009
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EXTENSIONS
| Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 29 2009
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