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, -1, 0), (-1, 0, -1), (-1, 0, 0), (1, -1, 0), (1, 1, 1)}.
A149545
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, -1, 0), (-1, 0, -1), (-1, 0, 0), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =55a(5) =183a(6) =819a(7) =2879a(8) =13133a(9) =49151a(10) =225573a(11) =872295a(12) =4045205a(13) =16029755a(14) =74663695a(15) =301759043a(16) =1412144445a(17) =5789266935a(18) =27186913513a(19) =112832278421a(20) =531322739697
External references
- oeis: A149545