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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
A149253
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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =138a(6) =518a(7) =1909a(8) =7396a(9) =29004a(10) =114650a(11) =458976a(12) =1855190a(13) =7520248a(14) =30736206a(15) =126536623a(16) =522647762a(17) =2167449134a(18) =9030785432a(19) =37737890674a(20) =158149549188a(21) =664941243940
External references
- oeis: A149253