A264175 Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 1324.

2, 29, 407, 5856, 84351, 1251246, 19318314, 311306106, 5247587002, 92593553775, 1709675651881, 33009644160452, 665774603385155, 14011066071814409, 307285854478257587, 7014599706534263680, 166463062283304010885, 4101715354110043233880, 104819153609360857542346

Offset

6,1

Links

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

Example

a(6) = 2: 132546, 142536.
a(7) = 29: 1243657, 1253647, 1324657, 1325467, 1325476, 1326475, 1326574, 1425367, 1425376, 1426375, 1426573, 1436572, 1526374, 1526473, 1536472, 2143657, 2153647, 2436571, 2536471, 3142657, 3152647, 4132657, 4152637, 5132647, 5142637, 6132547, 6142537, 7132546, 7142536.

Crossrefs

Column k=2 of A264173.

Sequence in context: A152274 A183722 A104535 * A187362 A176938 A006988

Adjacent sequences: A264172 A264173 A264174 * A264176 A264177 A264178

Keyword

nonn

Author

Alois P. Heinz, Nov 06 2015

Status

approved