Number of ascent sequences of length n with alternating ascents and descents (unaffected by level steps).

A294281

Number of ascent sequences of length n with alternating ascents and descents (unaffected by level steps).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =22a(6) =59a(7) =172a(8) =547a(9) =1886a(10) =7047a(11) =28360a(12) =122675a(13) =567210a(14) =2796999a(15) =14641044a(16) =81191947a(17) =475148678a(18) =2929442263a(19) =18965690560a(20) =128754649699a(21) =914056305794

External references