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), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.
A149957
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), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =52a(5) =182a(6) =669a(7) =2504a(8) =9698a(9) =38195a(10) =152767a(11) =621076a(12) =2549560a(13) =10581714a(14) =44310835a(15) =186883460a(16) =794030970a(17) =3393309246a(18) =14581119513a(19) =62974335852a(20) =273154359474
External references
- oeis: A149957