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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149689
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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =271a(6) =1157a(7) =4969a(8) =21857a(9) =97123a(10) =437175a(11) =1984469a(12) =9076269a(13) =41787233a(14) =193458113a(15) =900025657a(16) =4205206009a(17) =19722359955a(18) =92815660283a(19) =438114100691
External references
- oeis: A149689