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

Author

Alois P. Heinz, Nov 06 2015

Keywords

• nonn

Examples

			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.
		

Links

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

Crossrefs

Column k=2 of A264173.