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, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A149887
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, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =45a(5) =152a(6) =535a(7) =1943a(8) =7289a(9) =27876a(10) =108448a(11) =428477a(12) =1716434a(13) =6947541a(14) =28393225a(15) =117079643a(16) =486515806a(17) =2034989189a(18) =8565051207a(19) =36256323523a(20) =154246683731a(21) =659219337990
External references
- oeis: A149887