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, -1), (1, 0, 1)}.
A149318
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, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =35a(5) =137a(6) =495a(7) =1729a(8) =7098a(9) =27593a(10) =104531a(11) =441615a(12) =1789017a(13) =7095763a(14) =30558979a(15) =127135970a(16) =519443108a(17) =2268126113a(18) =9614119097a(19) =40107736971a(20) =176961174469a(21) =760585348983
External references
- oeis: A149318