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, -1), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A149230
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, -1), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =46a(5) =149a(6) =690a(7) =2497a(8) =11744a(9) =45062a(10) =214536a(11) =853892a(12) =4098631a(13) =16729527a(14) =80801096a(15) =335978483a(16) =1630298162a(17) =6876922865a(18) =33488217825a(19) =142893840268a(20) =697795200077
External references
- oeis: A149230