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, -1), (1, 0, 0), (1, 1, 1)}.
A150066
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, -1), (1, 0, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =64a(5) =214a(6) =778a(7) =2720a(8) =10190a(9) =36714a(10) =138694a(11) =508120a(12) =1942400a(13) =7215578a(14) =27705234a(15) =103824766a(16) =401157256a(17) =1515305878a(18) =5870905470a(19) =22296702332a(20) =86720976072a(21) =331044670238
External references
- oeis: A150066