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, 0), (-1, 1, -1), (1, -1, 0), (1, 0, 0), (1, 0, 1)}.
A149900
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, 0), (-1, 1, -1), (1, -1, 0), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =47a(5) =159a(6) =570a(7) =2073a(8) =7937a(9) =30410a(10) =119925a(11) =474811a(12) =1924495a(13) =7807044a(14) =32203887a(15) =133069917a(16) =557221720a(17) =2335779862a(18) =9894442363a(19) =41963425550a(20) =179491780393a(21) =768567676097
External references
- oeis: A149900