Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 0, -1), (1, 1, 0)}.
A149324
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =38a(5) =140a(6) =524a(7) =1945a(8) =7607a(9) =30451a(10) =121729a(11) =495258a(12) =2052186a(13) =8535846a(14) =35743505a(15) =151371003a(16) =644849874a(17) =2757517776a(18) =11867704367a(19) =51360479505a(20) =223020860987a(21) =972134840405
External references
- oeis: A149324