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 A264321 Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 3412. 2

%I

%S 1,23,379,5706,84354,1266150,19621124,316459848,5331647951,

%T 93959680785,1732274350449,33392773007922,672442070185276,

%U 14130089667648160,309458726679280550,7054945428667834408,167218369471952249237,4115763361988379577315,105071634182596234984655

%N Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 3412.

%H Alois P. Heinz, <a href="/A264321/b264321.txt">Table of n, a(n) for n = 6..200</a>

%e a(6) = 1: 563412.

%e a(7) = 23: 1674523, 2674513, 3674512, 4673512, 5614723, 5624713, 5634127, 5634712, 5673412, 5714623, 5724613, 5734126, 5734612, 6573412, 6714523, 6724513, 6734125, 6734512, 6735124, 6745123, 6745132, 6745231, 7563412.

%Y Column k=2 of A264319.

%K nonn

%O 6,2

%A _Alois P. Heinz_, Nov 11 2015

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Last modified September 18 12:28 EDT 2020. Contains 337169 sequences. (Running on oeis4.)