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A162845 Sum of digits of binomial(3n,n). 0
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; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..60.

EXAMPLE

a(4)=sum of digits of binomial(3*4,4)=18 because binomial(3*4,4)=495.

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); # Emeric Deutsch, Jul 29 2009

CROSSREFS

Sequence in context: A288570 A038046 A345100 * A239708 A038588 A111041

Adjacent sequences: A162842 A162843 A162844 * A162846 A162847 A162848

KEYWORD

nonn,base

AUTHOR

Yalcin Aktar, Jul 14 2009

EXTENSIONS

Extended by Emeric Deutsch, Jul 29 2009

STATUS

approved

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Last modified November 29 01:35 EST 2022. Contains 358421 sequences. (Running on oeis4.)