A307346 Number of uniquely sorted permutations of [2n+1] that avoid the patterns 231 and 4123.

1, 1, 3, 10, 36, 138, 553, 2288, 9699, 41908

Offset: 0

Author

Colin Defant, Apr 03 2019

Keywords

• nonn
• more

Examples

			The 3 uniquely sorted permutations of [7] that avoid 231 and 4123 are 2164357, 2143657, and 4321567.
		

Links

• C. Defant, Catalan intervals and uniquely sorted permutations, arXiv:1904.02627 [math.CO], 2019.

Crossrefs

Cf. A180874.