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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149631
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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =67a(5) =265a(6) =1181a(7) =5057a(8) =23041a(9) =102333a(10) =474523a(11) =2156643a(12) =10120107a(13) =46736465a(14) =221204517a(15) =1033504091a(16) =4923295415a(17) =23207349767a(18) =111106803733a(19) =527407044525
External references
- oeis: A149631