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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149260
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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =40a(5) =122a(6) =468a(7) =1567a(8) =6112a(9) =21162a(10) =83196a(11) =296598a(12) =1170760a(13) =4259252a(14) =16858192a(15) =62189887a(16) =246726504a(17) =919595326a(18) =3654991076a(19) =13734831550a(20) =54659800248a(21) =206768895132a(22) =823609387928
External references
- oeis: A149260