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

1, 23, 379, 5706, 84354, 1266150, 19621124, 316459848, 5331647951, 93959680785, 1732274350449, 33392773007922, 672442070185276, 14130089667648160, 309458726679280550, 7054945428667834408, 167218369471952249237, 4115763361988379577315, 105071634182596234984655

Offset: 6

Author

Alois P. Heinz, Nov 11 2015

Keywords

• nonn

Examples

			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.
		

Links

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

Crossrefs

Column k=2 of A264319.