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), (1, 0, 0), (1, 1, -1)}.
A148087
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), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =23a(6) =67a(7) =176a(8) =542a(9) =1543a(10) =4877a(11) =14356a(12) =47083a(13) =143445a(14) =480083a(15) =1507064a(16) =5092272a(17) =16235880a(18) =55737752a(19) =180527103a(20) =626181805a(21) =2059548580a(22) =7179842453a(23) =23828111246a(24) =83800665215a(25) =280652471697a(26) =993179081013
External references
- oeis: A148087