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

Author

Yalcin Aktar, Jul 14 2009

Keywords

• nonn
• base

Examples

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

Programs

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

Extensions

Extended by Emeric Deutsch, Jul 29 2009