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%I #6 Aug 29 2018 17:48:20
%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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