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), (-1, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149803
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), (-1, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =89a(5) =377a(6) =1831a(7) =8307a(8) =40565a(9) =189303a(10) =933393a(11) =4444391a(12) =21975921a(13) =105828359a(14) =525171549a(15) =2551014001a(16) =12677085287a(17) =61924637965a(18) =308237631627
External references
- oeis: A149803