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, 0), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
A149664
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, 0), (0, -1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =61a(5) =249a(6) =1003a(7) =4115a(8) =17371a(9) =73519a(10) =315575a(11) =1367431a(12) =5946949a(13) =26092679a(14) =115017031a(15) =508924409a(16) =2263672565a(17) =10098869293a(18) =45205624797a(19) =203017643007a(20) =913862154449
External references
- oeis: A149664