Number of level steps in all 2-Motzkin paths (i.e., Motzkin paths with blue and red level steps) of length n, without red level steps on the x-axis.
A126223
Number of level steps in all 2-Motzkin paths (i.e., Motzkin paths with blue and red level steps) of length n, without red level steps on the x-axis.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =7a(4) =26a(5) =98a(6) =372a(7) =1419a(8) =5434a(9) =20878a(10) =80444a(11) =310726a(12) =1202852a(13) =4665412a(14) =18126760a(15) =70538355a(16) =274877370a(17) =1072515990a(18) =4189573740a(19) =16383007410a(20) =64126407180a(21) =251226790620a(22) =985033185240
External references
- oeis: A126223