Number of permutations of [2n] with exactly n rising or falling successions.

A322295

Number of permutations of [2n] with exactly n rising or falling successions.

Terms

    a(0) =1a(1) =2a(2) =10a(3) =120a(4) =2198a(5) =54304a(6) =1674468a(7) =61736880a(8) =2644978110a(9) =129019925424

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