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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148394
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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =52a(6) =188a(7) =673a(8) =2528a(9) =9448a(10) =36232a(11) =138642a(12) =538502a(13) =2089746a(14) =8183600a(15) =32039011a(16) =126154812a(17) =496759140a(18) =1963415328a(19) =7761746678a(20) =30760767292a(21) =121938877154a(22) =484214723920
External references
- oeis: A148394