Numbers of alternating permutations where numbers at odd positions and even positions are monotone respectively.

A256644

Numbers of alternating permutations where numbers at odd positions and even positions are monotone respectively.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =6a(6) =9a(7) =12a(8) =21a(9) =30a(10) =58a(11) =86a(12) =176a(13) =266a(14) =563a(15) =860a(16) =1861a(17) =2862a(18) =6294a(19) =9726a(20) =21660a(21) =33594a(22) =75584a(23) =117574a(24) =266800a(25) =416026a(26) =950914a(27) =1485802a(28) =3417342a(29) =5348882

External references