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, 1, 1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
A148333
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, 1, 1), (0, 0, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =145a(7) =511a(8) =1878a(9) =7151a(10) =27975a(11) =111870a(12) =456021a(13) =1889917a(14) =7940790a(15) =33772677a(16) =145191428a(17) =630092620a(18) =2757388326a(19) =12157863845a(20) =53970276037a(21) =241044107881
External references
- oeis: A148333