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A318591 Number of n-member subsets of [3*n] whose elements sum to a multiple of three. 2

%I

%S 1,1,5,30,165,1001,6198,38760,245157,1562331,10015005,64512240,

%T 417226230,2707475148,17620076360,114955810530,751616304549,

%U 4923689695575,32308782871911,212327989773900,1397281501935165,9206478467531865,60727722660586800,400978991944396320

%N Number of n-member subsets of [3*n] whose elements sum to a multiple of three.

%H Alois P. Heinz, <a href="/A318591/b318591.txt">Table of n, a(n) for n = 0..1000</a>

%e a(2) = 5: {1,2}, {1,5}, {2,4}, {3,6}, {4,5}.

%Y Column k=3 of A318557.

%K nonn

%O 0,3

%A _Alois P. Heinz_, Aug 29 2018

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Last modified May 23 05:03 EDT 2019. Contains 323508 sequences. (Running on oeis4.)