A303853 - OEIS

%I #12 Sep 01 2019 02:38:31

%S 3,7,13,23,35,54,78,112,154,215,287,387,510,673,871,1133,1448,1857,

%T 2352,2980,3739,4697,5846,7278,9000,11122,13663,16778,20492,25011,

%U 30393,36892,44611,53891,64871,78003,93513,111970,133705,159476,189737,225477,267354

%N Number of pairs (lambda,mu) of partitions lambda of n and mu of three with mu <= lambda (by diagram containment).

%H Alois P. Heinz, <a href="/A303853/b303853.txt">Table of n, a(n) for n = 3..1000</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/FerrersDiagram.html">Ferrers Diagram</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Ferrers_diagram">Ferrers diagram</a>

%Y Column k=3 of A259478.

%K nonn

%O 3,1

%A _Alois P. Heinz_, May 01 2018