A222319 Number of classes created in S_n by the {132, 231}{213, 312}-equivalence.

1, 2, 4, 10, 26, 76, 234, 782, 2804, 10972, 47246, 224648

Offset

1,2

Links

Table of n, a(n) for n=1..12.

William Kuszmaul, Counting Permutations Modulo Pattern-Replacement Equivalences for Three-Letter Patterns, arXiv:1304.5667 [math.CO], 2013-2014.

Crossrefs

Sequence in context: A229053 A229068 A000085 * A047653 A148100 A149815

Adjacent sequences: A222316 A222317 A222318 * A222320 A222321 A222322

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 17 2013

Extensions

Notation edited by William Kuszmaul, Mar 06 2013

Status

approved