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, 1, 1), (0, 0, -1), (1, 0, 1)}.
A149250
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, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =127a(6) =469a(7) =1705a(8) =6434a(9) =24389a(10) =94673a(11) =368739a(12) =1454964a(13) =5771801a(14) =23119934a(15) =92992567a(16) =376491106a(17) =1530495385a(18) =6254576881a(19) =25645425145a(20) =105575282808a(21) =435948047107
External references
- oeis: A149250