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%I #8 Aug 14 2019 14:28:49
%S 3,5,31,365,6271,129130,2877421,66628441,1578320767,37983592076,
%T 925196176906,22754692780561,564123212097901,14079691134569845,
%U 353428830512017081,8915830309096530865,225890912989184760703,5744976464242932324976,146603288011226858621356
%N Number of set partitions of {1,2,...,3n} with sizes in {[n, n, n], [2n, n], [3n]}.
%C Fourth column in A260876. Apart from a(0) the same as A326998.
%Y Cf. A260876, A260878, A326998.
%K nonn,easy
%O 0,1
%A _Peter Luschny_, Aug 14 2019
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