Number of sequences of n integers p(i) i=0..n-1 with 0 <= p(i) <= 4*i and |p(i) - p(i-1)| <= 4.
A180900
Number of sequences of n integers p(i) i=0..n-1 with 0 <= p(i) <= 4*i and |p(i) - p(i-1)| <= 4.
Terms
- a(0) =1a(1) =5a(2) =35a(3) =265a(4) =2100a(5) =17075a(6) =141246a(7) =1182719a(8) =9994086a(9) =85049639a(10) =727865758a(11) =6257933219a(12) =54010196582a(13) =467657712902
External references
- oeis: A180900