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, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149819
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, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =80a(6) =240a(7) =756a(8) =2424a(9) =7904a(10) =26368a(11) =89324a(12) =305480a(13) =1056480a(14) =3693280a(15) =13011712a(16) =46144768a(17) =164775296a(18) =592005184a(19) =2137741872a(20) =7754971680a(21) =28258590336a(22) =103392253824a(23) =379649300944
External references
- oeis: A149819