A162845 Sum of digits of binomial(3n,n).

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

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