Number of Catalan paths (nonnegative, starting and ending at 0, step +/-1) of 2*n steps which reach at least 6 at some point.

A359311

Number of Catalan paths (nonnegative, starting and ending at 0, step +/-1) of 2*n steps which reach at least 6 at some point.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =12a(8) =89a(9) =528a(10) =2755a(11) =13244a(12) =60214a(13) =263121a(14) =1116791a(15) =4637476a(16) =18936940a(17) =76327705a(18) =304520286a(19) =1205152900a(20) =4738962369a(21) =18540020091a(22) =72240167011a(23) =280579954028

External references