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, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149812
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, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =26a(5) =71a(6) =213a(7) =656a(8) =2043a(9) =6510a(10) =21185a(11) =69751a(12) =232653a(13) =785663a(14) =2669329a(15) =9132465a(16) =31519477a(17) =109446096a(18) =381688232a(19) =1337901064a(20) =4711210673a(21) =16648931593a(22) =59052004172a(23) =210185465527a(24) =750190870068
External references
- oeis: A149812