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), (0, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A149332
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), (0, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =142a(6) =540a(7) =2041a(8) =7964a(9) =31688a(10) =128670a(11) =524420a(12) =2169274a(13) =9053525a(14) =38159532a(15) =161479853a(16) =688930108a(17) =2954700204a(18) =12747388511a(19) =55173583722a(20) =240023881585
External references
- oeis: A149332