login
A264175
Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 1324.
2
2, 29, 407, 5856, 84351, 1251246, 19318314, 311306106, 5247587002, 92593553775, 1709675651881, 33009644160452, 665774603385155, 14011066071814409, 307285854478257587, 7014599706534263680, 166463062283304010885, 4101715354110043233880, 104819153609360857542346
OFFSET
6,1
LINKS
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
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 06 2015
STATUS
approved