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, 1), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
A149278
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, 1), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =42a(5) =156a(6) =623a(7) =2562a(8) =10775a(9) =46314a(10) =202193a(11) =894617a(12) =4001675a(13) =18074562a(14) =82287790a(15) =377248774a(16) =1740375992a(17) =8071596078a(18) =37613773364a(19) =176041132719a(20) =827032930155
External references
- oeis: A149278