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, -1), (1, 0, -1), (1, 1, 0)}.
A148684
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, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =66a(6) =227a(7) =768a(8) =2753a(9) =9971a(10) =37279a(11) =140691a(12) =540745a(13) =2103349a(14) =8280868a(15) =32903529a(16) =131904514a(17) =533181995a(18) =2170444180a(19) =8892860703a(20) =36646858917a(21) =151866209400a(22) =632446821837
External references
- oeis: A148684