Number of 4-Motzkin paths of length n with no level steps at height 0.
A185132
Number of 4-Motzkin paths of length n with no level steps at height 0.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =4a(4) =18a(5) =84a(6) =405a(7) =2004a(8) =10126a(9) =52048a(10) =271338a(11) =1431400a(12) =7627348a(13) =40994652a(14) =221984157a(15) =1209902388a(16) =6632482710a(17) =36544255968a(18) =202275553662
External references
- oeis: A185132