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, 0), (0, -1, 0), (1, 1, 0), (1, 1, 1)}.
A150922
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, 0), (0, -1, 0), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =33a(4) =145a(5) =624a(6) =2777a(7) =12580a(8) =57449a(9) =265178a(10) =1235249a(11) =5773663a(12) =27205297a(13) =128532068a(14) =610043031a(15) =2905567631a(16) =13872723321a(17) =66445225624a(18) =318888929063
External references
- oeis: A150922