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A264321 Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 3412. 2
1, 23, 379, 5706, 84354, 1266150, 19621124, 316459848, 5331647951, 93959680785, 1732274350449, 33392773007922, 672442070185276, 14130089667648160, 309458726679280550, 7054945428667834408, 167218369471952249237, 4115763361988379577315, 105071634182596234984655 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 6..200

EXAMPLE

a(6) = 1: 563412.

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.

CROSSREFS

Column k=2 of A264319.

Sequence in context: A018071 A016325 A016324 * A285234 A046493 A014926

Adjacent sequences:  A264318 A264319 A264320 * A264322 A264323 A264324

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 11 2015

STATUS

approved

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Last modified August 6 18:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)