%I #4 Nov 14 2015 07:41:29
%S 2,41,492,4851,44291,394154,3502159,31450283,287335089,2680535274,
%T 25586566853,250169461829,2506738712869,25745302689807,
%U 270994937686871,2922760610595872,32288420619988347,365214362676429903,4227719744153328064,50063651356822568135
%N Number of permutations of [n] with exactly four (possibly overlapping) occurrences of the generalized pattern 12-3.
%H Alois P. Heinz, <a href="/A264453/b264453.txt">Table of n, a(n) for n = 5..500</a>
%Y Column k=4 of A260665.
%K nonn
%O 5,1
%A _Alois P. Heinz_, Nov 14 2015