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, 0)}.
A148703
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, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =71a(6) =246a(7) =848a(8) =3067a(9) =11203a(10) =41923a(11) =158643a(12) =609049a(13) =2360801a(14) =9241844a(15) =36462702a(16) =144923487a(17) =579644751a(18) =2331822681a(19) =9428784429a(20) =38304628521a(21) =156274395081a(22) =640047724638
External references
- oeis: A148703