The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #3 Apr 28 2014 11:19:13
%S 1,3,13,49,201,802,3343,14368,62909,282989,1299074,6111610,29330177,
%T 143869556,719339872,3669604633,19062972671,100880716332,543086732800,
%U 2974442015323,16556687511535,93655725178808,537951557765438,3137040309057826,18560431188723607
%N Number of standard Young tableaux with n cells and exactly four successions.
%C A succession is a pair of cells (v, v+1) lying in the same row.
%C Also number of ballot sequences having four flat steps.
%Y Column k=4 of A238125.
%K nonn
%O 5,2
%A _Joerg Arndt_ and _Alois P. Heinz_, Apr 28 2014