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, 0, -1), (0, 1, 1), (1, 0, -1)}.
A148695
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, 0, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =68a(6) =238a(7) =808a(8) =2938a(9) =10616a(10) =40028a(11) =151564a(12) =586471a(13) =2283160a(14) =9027376a(15) =35968594a(16) =144723618a(17) =585936607a(18) =2390988241a(19) =9817042075a(20) =40548235574a(21) =168289941614a(22) =701951164497
External references
- oeis: A148695