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), (1, 0, 1), (1, 1, -1)}.
A149333
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), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =142a(6) =542a(7) =2051a(8) =7968a(9) =31878a(10) =129379a(11) =526590a(12) =2177011a(13) =9114403a(14) =38339372a(15) =162138828a(16) =692133302a(17) =2971530483a(18) =12797863155a(19) =55397548914a(20) =241112647433
External references
- oeis: A149333